Add m-esr52 at 52.6.0

1 files changed, 3330 insertions, 0 deletions

diff --git a/devtools/shared/acorn/acorn.js b/devtools/shared/acorn/acorn.js
new file mode 100644
index 000000000..55d9a1968
--- /dev/null
+++ b/devtools/shared/acorn/acorn.js
@@ -0,0 +1,3330 @@
+(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.acorn = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){
+// A recursive descent parser operates by defining functions for all
+// syntactic elements, and recursively calling those, each function
+// advancing the input stream and returning an AST node. Precedence
+// of constructs (for example, the fact that `!x[1]` means `!(x[1])`
+// instead of `(!x)[1]` is handled by the fact that the parser
+// function that parses unary prefix operators is called first, and
+// in turn calls the function that parses `[]` subscripts — that
+// way, it'll receive the node for `x[1]` already parsed, and wraps
+// *that* in the unary operator node.
+//
+// Acorn uses an [operator precedence parser][opp] to handle binary
+// operator precedence, because it is much more compact than using
+// the technique outlined above, which uses different, nesting
+// functions to specify precedence, for all of the ten binary
+// precedence levels that JavaScript defines.
+//
+// [opp]: http://en.wikipedia.org/wiki/Operator-precedence_parser
+
+"use strict";
+
+var _tokentype = _dereq_("./tokentype");
+
+var _state = _dereq_("./state");
+
+var pp = _state.Parser.prototype;
+
+// Check if property name clashes with already added.
+// Object/class getters and setters are not allowed to clash —
+// either with each other or with an init property — and in
+// strict mode, init properties are also not allowed to be repeated.
+
+pp.checkPropClash = function (prop, propHash) {
+  if (this.options.ecmaVersion >= 6 && (prop.computed || prop.method || prop.shorthand)) return;
+  var key = prop.key;var name = undefined;
+  switch (key.type) {
+    case "Identifier":
+      name = key.name;break;
+    case "Literal":
+      name = String(key.value);break;
+    default:
+      return;
+  }
+  var kind = prop.kind;
+
+  if (this.options.ecmaVersion >= 6) {
+    if (name === "__proto__" && kind === "init") {
+      if (propHash.proto) this.raise(key.start, "Redefinition of __proto__ property");
+      propHash.proto = true;
+    }
+    return;
+  }
+  name = "$" + name;
+  var other = propHash[name];
+  if (other) {
+    var isGetSet = kind !== "init";
+    if ((this.strict || isGetSet) && other[kind] || !(isGetSet ^ other.init)) this.raise(key.start, "Redefinition of property");
+  } else {
+    other = propHash[name] = {
+      init: false,
+      get: false,
+      set: false
+    };
+  }
+  other[kind] = true;
+};
+
+// ### Expression parsing
+
+// These nest, from the most general expression type at the top to
+// 'atomic', nondivisible expression types at the bottom. Most of
+// the functions will simply let the function(s) below them parse,
+// and, *if* the syntactic construct they handle is present, wrap
+// the AST node that the inner parser gave them in another node.
+
+// Parse a full expression. The optional arguments are used to
+// forbid the `in` operator (in for loops initalization expressions)
+// and provide reference for storing '=' operator inside shorthand
+// property assignment in contexts where both object expression
+// and object pattern might appear (so it's possible to raise
+// delayed syntax error at correct position).
+
+pp.parseExpression = function (noIn, refDestructuringErrors) {
+  var startPos = this.start,
+      startLoc = this.startLoc;
+  var expr = this.parseMaybeAssign(noIn, refDestructuringErrors);
+  if (this.type === _tokentype.types.comma) {
+    var node = this.startNodeAt(startPos, startLoc);
+    node.expressions = [expr];
+    while (this.eat(_tokentype.types.comma)) node.expressions.push(this.parseMaybeAssign(noIn, refDestructuringErrors));
+    return this.finishNode(node, "SequenceExpression");
+  }
+  return expr;
+};
+
+// Parse an assignment expression. This includes applications of
+// operators like `+=`.
+
+pp.parseMaybeAssign = function (noIn, refDestructuringErrors, afterLeftParse) {
+  if (this.type == _tokentype.types._yield && this.inGenerator) return this.parseYield();
+
+  var validateDestructuring = false;
+  if (!refDestructuringErrors) {
+    refDestructuringErrors = { shorthandAssign: 0, trailingComma: 0 };
+    validateDestructuring = true;
+  }
+  var startPos = this.start,
+      startLoc = this.startLoc;
+  if (this.type == _tokentype.types.parenL || this.type == _tokentype.types.name) this.potentialArrowAt = this.start;
+  var left = this.parseMaybeConditional(noIn, refDestructuringErrors);
+  if (afterLeftParse) left = afterLeftParse.call(this, left, startPos, startLoc);
+  if (this.type.isAssign) {
+    if (validateDestructuring) this.checkPatternErrors(refDestructuringErrors, true);
+    var node = this.startNodeAt(startPos, startLoc);
+    node.operator = this.value;
+    node.left = this.type === _tokentype.types.eq ? this.toAssignable(left) : left;
+    refDestructuringErrors.shorthandAssign = 0; // reset because shorthand default was used correctly
+    this.checkLVal(left);
+    this.next();
+    node.right = this.parseMaybeAssign(noIn);
+    return this.finishNode(node, "AssignmentExpression");
+  } else {
+    if (validateDestructuring) this.checkExpressionErrors(refDestructuringErrors, true);
+  }
+  return left;
+};
+
+// Parse a ternary conditional (`?:`) operator.
+
+pp.parseMaybeConditional = function (noIn, refDestructuringErrors) {
+  var startPos = this.start,
+      startLoc = this.startLoc;
+  var expr = this.parseExprOps(noIn, refDestructuringErrors);
+  if (this.checkExpressionErrors(refDestructuringErrors)) return expr;
+  if (this.eat(_tokentype.types.question)) {
+    var node = this.startNodeAt(startPos, startLoc);
+    node.test = expr;
+    node.consequent = this.parseMaybeAssign();
+    this.expect(_tokentype.types.colon);
+    node.alternate = this.parseMaybeAssign(noIn);
+    return this.finishNode(node, "ConditionalExpression");
+  }
+  return expr;
+};
+
+// Start the precedence parser.
+
+pp.parseExprOps = function (noIn, refDestructuringErrors) {
+  var startPos = this.start,
+      startLoc = this.startLoc;
+  var expr = this.parseMaybeUnary(refDestructuringErrors);
+  if (this.checkExpressionErrors(refDestructuringErrors)) return expr;
+  return this.parseExprOp(expr, startPos, startLoc, -1, noIn);
+};
+
+// Parse binary operators with the operator precedence parsing
+// algorithm. `left` is the left-hand side of the operator.
+// `minPrec` provides context that allows the function to stop and
+// defer further parser to one of its callers when it encounters an
+// operator that has a lower precedence than the set it is parsing.
+
+pp.parseExprOp = function (left, leftStartPos, leftStartLoc, minPrec, noIn) {
+  var prec = this.type.binop;
+  if (prec != null && (!noIn || this.type !== _tokentype.types._in)) {
+    if (prec > minPrec) {
+      var node = this.startNodeAt(leftStartPos, leftStartLoc);
+      node.left = left;
+      node.operator = this.value;
+      var op = this.type;
+      this.next();
+      var startPos = this.start,
+          startLoc = this.startLoc;
+      node.right = this.parseExprOp(this.parseMaybeUnary(), startPos, startLoc, prec, noIn);
+      this.finishNode(node, op === _tokentype.types.logicalOR || op === _tokentype.types.logicalAND ? "LogicalExpression" : "BinaryExpression");
+      return this.parseExprOp(node, leftStartPos, leftStartLoc, minPrec, noIn);
+    }
+  }
+  return left;
+};
+
+// Parse unary operators, both prefix and postfix.
+
+pp.parseMaybeUnary = function (refDestructuringErrors) {
+  if (this.type.prefix) {
+    var node = this.startNode(),
+        update = this.type === _tokentype.types.incDec;
+    node.operator = this.value;
+    node.prefix = true;
+    this.next();
+    node.argument = this.parseMaybeUnary();
+    this.checkExpressionErrors(refDestructuringErrors, true);
+    if (update) this.checkLVal(node.argument);else if (this.strict && node.operator === "delete" && node.argument.type === "Identifier") this.raise(node.start, "Deleting local variable in strict mode");
+    return this.finishNode(node, update ? "UpdateExpression" : "UnaryExpression");
+  }
+  var startPos = this.start,
+      startLoc = this.startLoc;
+  var expr = this.parseExprSubscripts(refDestructuringErrors);
+  if (this.checkExpressionErrors(refDestructuringErrors)) return expr;
+  while (this.type.postfix && !this.canInsertSemicolon()) {
+    var node = this.startNodeAt(startPos, startLoc);
+    node.operator = this.value;
+    node.prefix = false;
+    node.argument = expr;
+    this.checkLVal(expr);
+    this.next();
+    expr = this.finishNode(node, "UpdateExpression");
+  }
+  return expr;
+};
+
+// Parse call, dot, and `[]`-subscript expressions.
+
+pp.parseExprSubscripts = function (refDestructuringErrors) {
+  var startPos = this.start,
+      startLoc = this.startLoc;
+  var expr = this.parseExprAtom(refDestructuringErrors);
+  var skipArrowSubscripts = expr.type === "ArrowFunctionExpression" && this.input.slice(this.lastTokStart, this.lastTokEnd) !== ")";
+  if (this.checkExpressionErrors(refDestructuringErrors) || skipArrowSubscripts) return expr;
+  return this.parseSubscripts(expr, startPos, startLoc);
+};
+
+pp.parseSubscripts = function (base, startPos, startLoc, noCalls) {
+  for (;;) {
+    if (this.eat(_tokentype.types.dot)) {
+      var node = this.startNodeAt(startPos, startLoc);
+      node.object = base;
+      node.property = this.parseIdent(true);
+      node.computed = false;
+      base = this.finishNode(node, "MemberExpression");
+    } else if (this.eat(_tokentype.types.bracketL)) {
+      var node = this.startNodeAt(startPos, startLoc);
+      node.object = base;
+      node.property = this.parseExpression();
+      node.computed = true;
+      this.expect(_tokentype.types.bracketR);
+      base = this.finishNode(node, "MemberExpression");
+    } else if (!noCalls && this.eat(_tokentype.types.parenL)) {
+      var node = this.startNodeAt(startPos, startLoc);
+      node.callee = base;
+      node.arguments = this.parseExprList(_tokentype.types.parenR, false);
+      base = this.finishNode(node, "CallExpression");
+    } else if (this.type === _tokentype.types.backQuote) {
+      var node = this.startNodeAt(startPos, startLoc);
+      node.tag = base;
+      node.quasi = this.parseTemplate();
+      base = this.finishNode(node, "TaggedTemplateExpression");
+    } else {
+      return base;
+    }
+  }
+};
+
+// Parse an atomic expression — either a single token that is an
+// expression, an expression started by a keyword like `function` or
+// `new`, or an expression wrapped in punctuation like `()`, `[]`,
+// or `{}`.
+
+pp.parseExprAtom = function (refDestructuringErrors) {
+  var node = undefined,
+      canBeArrow = this.potentialArrowAt == this.start;
+  switch (this.type) {
+    case _tokentype.types._super:
+      if (!this.inFunction) this.raise(this.start, "'super' outside of function or class");
+    case _tokentype.types._this:
+      var type = this.type === _tokentype.types._this ? "ThisExpression" : "Super";
+      node = this.startNode();
+      this.next();
+      return this.finishNode(node, type);
+
+    case _tokentype.types._yield:
+      if (this.inGenerator) this.unexpected();
+
+    case _tokentype.types.name:
+      var startPos = this.start,
+          startLoc = this.startLoc;
+      var id = this.parseIdent(this.type !== _tokentype.types.name);
+      if (canBeArrow && !this.canInsertSemicolon() && this.eat(_tokentype.types.arrow)) return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), [id]);
+      return id;
+
+    case _tokentype.types.regexp:
+      var value = this.value;
+      node = this.parseLiteral(value.value);
+      node.regex = { pattern: value.pattern, flags: value.flags };
+      return node;
+
+    case _tokentype.types.num:case _tokentype.types.string:
+      return this.parseLiteral(this.value);
+
+    case _tokentype.types._null:case _tokentype.types._true:case _tokentype.types._false:
+      node = this.startNode();
+      node.value = this.type === _tokentype.types._null ? null : this.type === _tokentype.types._true;
+      node.raw = this.type.keyword;
+      this.next();
+      return this.finishNode(node, "Literal");
+
+    case _tokentype.types.parenL:
+      return this.parseParenAndDistinguishExpression(canBeArrow);
+
+    case _tokentype.types.bracketL:
+      node = this.startNode();
+      this.next();
+      // check whether this is array comprehension or regular array
+      if (this.options.ecmaVersion >= 7 && this.type === _tokentype.types._for) {
+        return this.parseComprehension(node, false);
+      }
+      node.elements = this.parseExprList(_tokentype.types.bracketR, true, true, refDestructuringErrors);
+      return this.finishNode(node, "ArrayExpression");
+
+    case _tokentype.types.braceL:
+      return this.parseObj(false, refDestructuringErrors);
+
+    case _tokentype.types._function:
+      node = this.startNode();
+      this.next();
+      return this.parseFunction(node, false);
+
+    case _tokentype.types._class:
+      return this.parseClass(this.startNode(), false);
+
+    case _tokentype.types._new:
+      return this.parseNew();
+
+    case _tokentype.types.backQuote:
+      return this.parseTemplate();
+
+    default:
+      this.unexpected();
+  }
+};
+
+pp.parseLiteral = function (value) {
+  var node = this.startNode();
+  node.value = value;
+  node.raw = this.input.slice(this.start, this.end);
+  this.next();
+  return this.finishNode(node, "Literal");
+};
+
+pp.parseParenExpression = function () {
+  this.expect(_tokentype.types.parenL);
+  var val = this.parseExpression();
+  this.expect(_tokentype.types.parenR);
+  return val;
+};
+
+pp.parseParenAndDistinguishExpression = function (canBeArrow) {
+  var startPos = this.start,
+      startLoc = this.startLoc,
+      val = undefined;
+  if (this.options.ecmaVersion >= 6) {
+    this.next();
+
+    if (this.options.ecmaVersion >= 7 && this.type === _tokentype.types._for) {
+      return this.parseComprehension(this.startNodeAt(startPos, startLoc), true);
+    }
+
+    var innerStartPos = this.start,
+        innerStartLoc = this.startLoc;
+    var exprList = [],
+        first = true;
+    var refDestructuringErrors = { shorthandAssign: 0, trailingComma: 0 },
+        spreadStart = undefined,
+        innerParenStart = undefined;
+    while (this.type !== _tokentype.types.parenR) {
+      first ? first = false : this.expect(_tokentype.types.comma);
+      if (this.type === _tokentype.types.ellipsis) {
+        spreadStart = this.start;
+        exprList.push(this.parseParenItem(this.parseRest()));
+        break;
+      } else {
+        if (this.type === _tokentype.types.parenL && !innerParenStart) {
+          innerParenStart = this.start;
+        }
+        exprList.push(this.parseMaybeAssign(false, refDestructuringErrors, this.parseParenItem));
+      }
+    }
+    var innerEndPos = this.start,
+        innerEndLoc = this.startLoc;
+    this.expect(_tokentype.types.parenR);
+
+    if (canBeArrow && !this.canInsertSemicolon() && this.eat(_tokentype.types.arrow)) {
+      this.checkPatternErrors(refDestructuringErrors, true);
+      if (innerParenStart) this.unexpected(innerParenStart);
+      return this.parseParenArrowList(startPos, startLoc, exprList);
+    }
+
+    if (!exprList.length) this.unexpected(this.lastTokStart);
+    if (spreadStart) this.unexpected(spreadStart);
+    this.checkExpressionErrors(refDestructuringErrors, true);
+
+    if (exprList.length > 1) {
+      val = this.startNodeAt(innerStartPos, innerStartLoc);
+      val.expressions = exprList;
+      this.finishNodeAt(val, "SequenceExpression", innerEndPos, innerEndLoc);
+    } else {
+      val = exprList[0];
+    }
+  } else {
+    val = this.parseParenExpression();
+  }
+
+  if (this.options.preserveParens) {
+    var par = this.startNodeAt(startPos, startLoc);
+    par.expression = val;
+    return this.finishNode(par, "ParenthesizedExpression");
+  } else {
+    return val;
+  }
+};
+
+pp.parseParenItem = function (item) {
+  return item;
+};
+
+pp.parseParenArrowList = function (startPos, startLoc, exprList) {
+  return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), exprList);
+};
+
+// New's precedence is slightly tricky. It must allow its argument
+// to be a `[]` or dot subscript expression, but not a call — at
+// least, not without wrapping it in parentheses. Thus, it uses the
+
+var empty = [];
+
+pp.parseNew = function () {
+  var node = this.startNode();
+  var meta = this.parseIdent(true);
+  if (this.options.ecmaVersion >= 6 && this.eat(_tokentype.types.dot)) {
+    node.meta = meta;
+    node.property = this.parseIdent(true);
+    if (node.property.name !== "target") this.raise(node.property.start, "The only valid meta property for new is new.target");
+    if (!this.inFunction) this.raise(node.start, "new.target can only be used in functions");
+    return this.finishNode(node, "MetaProperty");
+  }
+  var startPos = this.start,
+      startLoc = this.startLoc;
+  node.callee = this.parseSubscripts(this.parseExprAtom(), startPos, startLoc, true);
+  if (this.eat(_tokentype.types.parenL)) node.arguments = this.parseExprList(_tokentype.types.parenR, false);else node.arguments = empty;
+  return this.finishNode(node, "NewExpression");
+};
+
+// Parse template expression.
+
+pp.parseTemplateElement = function () {
+  var elem = this.startNode();
+  elem.value = {
+    raw: this.input.slice(this.start, this.end).replace(/\r\n?/g, '\n'),
+    cooked: this.value
+  };
+  this.next();
+  elem.tail = this.type === _tokentype.types.backQuote;
+  return this.finishNode(elem, "TemplateElement");
+};
+
+pp.parseTemplate = function () {
+  var node = this.startNode();
+  this.next();
+  node.expressions = [];
+  var curElt = this.parseTemplateElement();
+  node.quasis = [curElt];
+  while (!curElt.tail) {
+    this.expect(_tokentype.types.dollarBraceL);
+    node.expressions.push(this.parseExpression());
+    this.expect(_tokentype.types.braceR);
+    node.quasis.push(curElt = this.parseTemplateElement());
+  }
+  this.next();
+  return this.finishNode(node, "TemplateLiteral");
+};
+
+// Parse an object literal or binding pattern.
+
+pp.parseObj = function (isPattern, refDestructuringErrors) {
+  var node = this.startNode(),
+      first = true,
+      propHash = {};
+  node.properties = [];
+  this.next();
+  while (!this.eat(_tokentype.types.braceR)) {
+    if (!first) {
+      this.expect(_tokentype.types.comma);
+      if (this.afterTrailingComma(_tokentype.types.braceR)) break;
+    } else first = false;
+
+    var prop = this.startNode(),
+        isGenerator = undefined,
+        startPos = undefined,
+        startLoc = undefined;
+    if (this.options.ecmaVersion >= 6) {
+      prop.method = false;
+      prop.shorthand = false;
+      if (isPattern || refDestructuringErrors) {
+        startPos = this.start;
+        startLoc = this.startLoc;
+      }
+      if (!isPattern) isGenerator = this.eat(_tokentype.types.star);
+    }
+    this.parsePropertyName(prop);
+    this.parsePropertyValue(prop, isPattern, isGenerator, startPos, startLoc, refDestructuringErrors);
+    this.checkPropClash(prop, propHash);
+    node.properties.push(this.finishNode(prop, "Property"));
+  }
+  return this.finishNode(node, isPattern ? "ObjectPattern" : "ObjectExpression");
+};
+
+pp.parsePropertyValue = function (prop, isPattern, isGenerator, startPos, startLoc, refDestructuringErrors) {
+  if (this.eat(_tokentype.types.colon)) {
+    prop.value = isPattern ? this.parseMaybeDefault(this.start, this.startLoc) : this.parseMaybeAssign(false, refDestructuringErrors);
+    prop.kind = "init";
+  } else if (this.options.ecmaVersion >= 6 && this.type === _tokentype.types.parenL) {
+    if (isPattern) this.unexpected();
+    prop.kind = "init";
+    prop.method = true;
+    prop.value = this.parseMethod(isGenerator);
+  } else if (this.options.ecmaVersion >= 5 && !prop.computed && prop.key.type === "Identifier" && (prop.key.name === "get" || prop.key.name === "set") && (this.type != _tokentype.types.comma && this.type != _tokentype.types.braceR)) {
+    if (isGenerator || isPattern) this.unexpected();
+    prop.kind = prop.key.name;
+    this.parsePropertyName(prop);
+    prop.value = this.parseMethod(false);
+    var paramCount = prop.kind === "get" ? 0 : 1;
+    if (prop.value.params.length !== paramCount) {
+      var start = prop.value.start;
+      if (prop.kind === "get") this.raise(start, "getter should have no params");else this.raise(start, "setter should have exactly one param");
+    }
+  } else if (this.options.ecmaVersion >= 6 && !prop.computed && prop.key.type === "Identifier") {
+    prop.kind = "init";
+    if (isPattern) {
+      if (this.keywords.test(prop.key.name) || (this.strict ? this.reservedWordsStrictBind : this.reservedWords).test(prop.key.name)) this.raise(prop.key.start, "Binding " + prop.key.name);
+      prop.value = this.parseMaybeDefault(startPos, startLoc, prop.key);
+    } else if (this.type === _tokentype.types.eq && refDestructuringErrors) {
+      if (!refDestructuringErrors.shorthandAssign) refDestructuringErrors.shorthandAssign = this.start;
+      prop.value = this.parseMaybeDefault(startPos, startLoc, prop.key);
+    } else {
+      prop.value = prop.key;
+    }
+    prop.shorthand = true;
+  } else this.unexpected();
+};
+
+pp.parsePropertyName = function (prop) {
+  if (this.options.ecmaVersion >= 6) {
+    if (this.eat(_tokentype.types.bracketL)) {
+      prop.computed = true;
+      prop.key = this.parseMaybeAssign();
+      this.expect(_tokentype.types.bracketR);
+      return prop.key;
+    } else {
+      prop.computed = false;
+    }
+  }
+  return prop.key = this.type === _tokentype.types.num || this.type === _tokentype.types.string ? this.parseExprAtom() : this.parseIdent(true);
+};
+
+// Initialize empty function node.
+
+pp.initFunction = function (node) {
+  node.id = null;
+  if (this.options.ecmaVersion >= 6) {
+    node.generator = false;
+    node.expression = false;
+  }
+};
+
+// Parse object or class method.
+
+pp.parseMethod = function (isGenerator) {
+  var node = this.startNode();
+  this.initFunction(node);
+  this.expect(_tokentype.types.parenL);
+  node.params = this.parseBindingList(_tokentype.types.parenR, false, false);
+  if (this.options.ecmaVersion >= 6) node.generator = isGenerator;
+  this.parseFunctionBody(node, false);
+  return this.finishNode(node, "FunctionExpression");
+};
+
+// Parse arrow function expression with given parameters.
+
+pp.parseArrowExpression = function (node, params) {
+  this.initFunction(node);
+  node.params = this.toAssignableList(params, true);
+  this.parseFunctionBody(node, true);
+  return this.finishNode(node, "ArrowFunctionExpression");
+};
+
+// Parse function body and check parameters.
+
+pp.parseFunctionBody = function (node, isArrowFunction) {
+  var isExpression = isArrowFunction && this.type !== _tokentype.types.braceL;
+
+  if (isExpression) {
+    node.body = this.parseMaybeAssign();
+    node.expression = true;
+  } else {
+    // Start a new scope with regard to labels and the `inFunction`
+    // flag (restore them to their old value afterwards).
+    var oldInFunc = this.inFunction,
+        oldInGen = this.inGenerator,
+        oldLabels = this.labels;
+    this.inFunction = true;this.inGenerator = node.generator;this.labels = [];
+    node.body = this.parseBlock(true);
+    node.expression = false;
+    this.inFunction = oldInFunc;this.inGenerator = oldInGen;this.labels = oldLabels;
+  }
+
+  // If this is a strict mode function, verify that argument names
+  // are not repeated, and it does not try to bind the words `eval`
+  // or `arguments`.
+  if (this.strict || !isExpression && node.body.body.length && this.isUseStrict(node.body.body[0])) {
+    var oldStrict = this.strict;
+    this.strict = true;
+    if (node.id) this.checkLVal(node.id, true);
+    this.checkParams(node);
+    this.strict = oldStrict;
+  } else if (isArrowFunction) {
+    this.checkParams(node);
+  }
+};
+
+// Checks function params for various disallowed patterns such as using "eval"
+// or "arguments" and duplicate parameters.
+
+pp.checkParams = function (node) {
+  var nameHash = {};
+  for (var i = 0; i < node.params.length; i++) {
+    this.checkLVal(node.params[i], true, nameHash);
+  }
+};
+
+// Parses a comma-separated list of expressions, and returns them as
+// an array. `close` is the token type that ends the list, and
+// `allowEmpty` can be turned on to allow subsequent commas with
+// nothing in between them to be parsed as `null` (which is needed
+// for array literals).
+
+pp.parseExprList = function (close, allowTrailingComma, allowEmpty, refDestructuringErrors) {
+  var elts = [],
+      first = true;
+  while (!this.eat(close)) {
+    if (!first) {
+      this.expect(_tokentype.types.comma);
+      if (this.type === close && refDestructuringErrors && !refDestructuringErrors.trailingComma) {
+        refDestructuringErrors.trailingComma = this.lastTokStart;
+      }
+      if (allowTrailingComma && this.afterTrailingComma(close)) break;
+    } else first = false;
+
+    var elt = undefined;
+    if (allowEmpty && this.type === _tokentype.types.comma) elt = null;else if (this.type === _tokentype.types.ellipsis) elt = this.parseSpread(refDestructuringErrors);else elt = this.parseMaybeAssign(false, refDestructuringErrors);
+    elts.push(elt);
+  }
+  return elts;
+};
+
+// Parse the next token as an identifier. If `liberal` is true (used
+// when parsing properties), it will also convert keywords into
+// identifiers.
+
+pp.parseIdent = function (liberal) {
+  var node = this.startNode();
+  if (liberal && this.options.allowReserved == "never") liberal = false;
+  if (this.type === _tokentype.types.name) {
+    if (!liberal && (this.strict ? this.reservedWordsStrict : this.reservedWords).test(this.value) && (this.options.ecmaVersion >= 6 || this.input.slice(this.start, this.end).indexOf("\\") == -1)) this.raise(this.start, "The keyword '" + this.value + "' is reserved");
+    node.name = this.value;
+  } else if (liberal && this.type.keyword) {
+    node.name = this.type.keyword;
+  } else {
+    this.unexpected();
+  }
+  this.next();
+  return this.finishNode(node, "Identifier");
+};
+
+// Parses yield expression inside generator.
+
+pp.parseYield = function () {
+  var node = this.startNode();
+  this.next();
+  if (this.type == _tokentype.types.semi || this.canInsertSemicolon() || this.type != _tokentype.types.star && !this.type.startsExpr) {
+    node.delegate = false;
+    node.argument = null;
+  } else {
+    node.delegate = this.eat(_tokentype.types.star);
+    node.argument = this.parseMaybeAssign();
+  }
+  return this.finishNode(node, "YieldExpression");
+};
+
+// Parses array and generator comprehensions.
+
+pp.parseComprehension = function (node, isGenerator) {
+  node.blocks = [];
+  while (this.type === _tokentype.types._for) {
+    var block = this.startNode();
+    this.next();
+    this.expect(_tokentype.types.parenL);
+    block.left = this.parseBindingAtom();
+    this.checkLVal(block.left, true);
+    this.expectContextual("of");
+    block.right = this.parseExpression();
+    this.expect(_tokentype.types.parenR);
+    node.blocks.push(this.finishNode(block, "ComprehensionBlock"));
+  }
+  node.filter = this.eat(_tokentype.types._if) ? this.parseParenExpression() : null;
+  node.body = this.parseExpression();
+  this.expect(isGenerator ? _tokentype.types.parenR : _tokentype.types.bracketR);
+  node.generator = isGenerator;
+  return this.finishNode(node, "ComprehensionExpression");
+};
+
+},{"./state":10,"./tokentype":14}],2:[function(_dereq_,module,exports){
+// This is a trick taken from Esprima. It turns out that, on
+// non-Chrome browsers, to check whether a string is in a set, a
+// predicate containing a big ugly `switch` statement is faster than
+// a regular expression, and on Chrome the two are about on par.
+// This function uses `eval` (non-lexical) to produce such a
+// predicate from a space-separated string of words.
+//
+// It starts by sorting the words by length.
+
+// Reserved word lists for various dialects of the language
+
+"use strict";
+
+exports.__esModule = true;
+exports.isIdentifierStart = isIdentifierStart;
+exports.isIdentifierChar = isIdentifierChar;
+var reservedWords = {
+  3: "abstract boolean byte char class double enum export extends final float goto implements import int interface long native package private protected public short static super synchronized throws transient volatile",
+  5: "class enum extends super const export import",
+  6: "enum",
+  strict: "implements interface let package private protected public static yield",
+  strictBind: "eval arguments"
+};
+
+exports.reservedWords = reservedWords;
+// And the keywords
+
+var ecma5AndLessKeywords = "break case catch continue debugger default do else finally for function if return switch throw try var while with null true false instanceof typeof void delete new in this";
+
+var keywords = {
+  5: ecma5AndLessKeywords,
+  6: ecma5AndLessKeywords + " let const class extends export import yield super"
+};
+
+exports.keywords = keywords;
+// ## Character categories
+
+// Big ugly regular expressions that match characters in the
+// whitespace, identifier, and identifier-start categories. These
+// are only applied when a character is found to actually have a
+// code point above 128.
+// Generated by `bin/generate-identifier-regex.js`.
+
+var nonASCIIidentifierStartChars = "ªµºÀ-ÖØ-öø-ˁˆ-ˑˠ-ˤˬˮͰ-ʹͶͷͺ-ͽͿΆΈ-ΊΌΎ-ΡΣ-ϵϷ-ҁҊ-ԯԱ-Ֆՙա-ևא-תװ-ײؠ-يٮٯٱ-ۓەۥۦۮۯۺ-ۼۿܐܒ-ܯݍ-ޥޱߊ-ߪߴߵߺࠀ-ࠕࠚࠤࠨࡀ-ࡘࢠ-ࢲऄ-हऽॐक़-ॡॱ-ঀঅ-ঌএঐও-নপ-রলশ-হঽৎড়ঢ়য়-ৡৰৱਅ-ਊਏਐਓ-ਨਪ-ਰਲਲ਼ਵਸ਼ਸਹਖ਼-ੜਫ਼ੲ-ੴઅ-ઍએ-ઑઓ-નપ-રલળવ-હઽૐૠૡଅ-ଌଏଐଓ-ନପ-ରଲଳଵ-ହଽଡ଼ଢ଼ୟ-ୡୱஃஅ-ஊஎ-ஐஒ-கஙசஜஞடணதந-பம-ஹௐఅ-ఌఎ-ఐఒ-నప-హఽౘౙౠౡಅ-ಌಎ-ಐಒ-ನಪ-ಳವ-ಹಽೞೠೡೱೲഅ-ഌഎ-ഐഒ-ഺഽൎൠൡൺ-ൿඅ-ඖක-නඳ-රලව-ෆก-ะาำเ-ๆກຂຄງຈຊຍດ-ທນ-ຟມ-ຣລວສຫອ-ະາຳຽເ-ໄໆໜ-ໟༀཀ-ཇཉ-ཬྈ-ྌက-ဪဿၐ-ၕၚ-ၝၡၥၦၮ-ၰၵ-ႁႎႠ-ჅჇჍა-ჺჼ-ቈቊ-ቍቐ-ቖቘቚ-ቝበ-ኈኊ-ኍነ-ኰኲ-ኵኸ-ኾዀዂ-ዅወ-ዖዘ-ጐጒ-ጕጘ-ፚᎀ-ᎏᎠ-Ᏼᐁ-ᙬᙯ-ᙿᚁ-ᚚᚠ-ᛪᛮ-ᛸᜀ-ᜌᜎ-ᜑᜠ-ᜱᝀ-ᝑᝠ-ᝬᝮ-ᝰក-ឳៗៜᠠ-ᡷᢀ-ᢨᢪᢰ-ᣵᤀ-ᤞᥐ-ᥭᥰ-ᥴᦀ-ᦫᧁ-ᧇᨀ-ᨖᨠ-ᩔᪧᬅ-ᬳᭅ-ᭋᮃ-ᮠᮮᮯᮺ-ᯥᰀ-ᰣᱍ-ᱏᱚ-ᱽᳩ-ᳬᳮ-ᳱᳵᳶᴀ-ᶿḀ-ἕἘ-Ἕἠ-ὅὈ-Ὅὐ-ὗὙὛὝὟ-ώᾀ-ᾴᾶ-ᾼιῂ-ῄῆ-ῌῐ-ΐῖ-Ίῠ-Ῥῲ-ῴῶ-ῼⁱⁿₐ-ₜℂℇℊ-ℓℕ℘-ℝℤΩℨK-ℹℼ-ℿⅅ-ⅉⅎⅠ-ↈⰀ-Ⱞⰰ-ⱞⱠ-ⳤⳫ-ⳮⳲⳳⴀ-ⴥⴧⴭⴰ-ⵧⵯⶀ-ⶖⶠ-ⶦⶨ-ⶮⶰ-ⶶⶸ-ⶾⷀ-ⷆⷈ-ⷎⷐ-ⷖⷘ-ⷞ々-〇〡-〩〱-〵〸-〼ぁ-ゖ゛-ゟァ-ヺー-ヿㄅ-ㄭㄱ-ㆎㆠ-ㆺㇰ-ㇿ㐀-䶵一-鿌ꀀ-ꒌꓐ-ꓽꔀ-ꘌꘐ-ꘟꘪꘫꙀ-ꙮꙿ-ꚝꚠ-ꛯꜗ-ꜟꜢ-ꞈꞋ-ꞎꞐ-ꞭꞰꞱꟷ-ꠁꠃ-ꠅꠇ-ꠊꠌ-ꠢꡀ-ꡳꢂ-ꢳꣲ-ꣷꣻꤊ-ꤥꤰ-ꥆꥠ-ꥼꦄ-ꦲꧏꧠ-ꧤꧦ-ꧯꧺ-ꧾꨀ-ꨨꩀ-ꩂꩄ-ꩋꩠ-ꩶꩺꩾ-ꪯꪱꪵꪶꪹ-ꪽꫀꫂꫛ-ꫝꫠ-ꫪꫲ-ꫴꬁ-ꬆꬉ-ꬎꬑ-ꬖꬠ-ꬦꬨ-ꬮꬰ-ꭚꭜ-ꭟꭤꭥꯀ-ꯢ가-힣ힰ-ퟆퟋ-ퟻ豈-舘並-龎ff-stﬓ-ﬗיִײַ-ﬨשׁ-זּטּ-לּמּנּסּףּפּצּ-ﮱﯓ-ﴽﵐ-ﶏﶒ-ﷇﷰ-ﷻﹰ-ﹴﹶ-ﻼＡ-Ｚａ-ｚｦ-ﾾￂ-ￇￊ-ￏￒ-ￗￚ-ￜ";
+var nonASCIIidentifierChars = "‌‍·̀-ͯ·҃-֑҇-ׇֽֿׁׂׅׄؐ-ًؚ-٩ٰۖ-ۜ۟-۪ۤۧۨ-ۭ۰-۹ܑܰ-݊ަ-ް߀-߉߫-߳ࠖ-࠙ࠛ-ࠣࠥ-ࠧࠩ-࡙࠭-࡛ࣤ-ःऺ-़ा-ॏ॑-ॗॢॣ०-९ঁ-ঃ়া-ৄেৈো-্ৗৢৣ০-৯ਁ-ਃ਼ਾ-ੂੇੈੋ-੍ੑ੦-ੱੵઁ-ઃ઼ા-ૅે-ૉો-્ૢૣ૦-૯ଁ-ଃ଼ା-ୄେୈୋ-୍ୖୗୢୣ୦-୯ஂா-ூெ-ைொ-்ௗ௦-௯ఀ-ఃా-ౄె-ైొ-్ౕౖౢౣ౦-౯ಁ-ಃ಼ಾ-ೄೆ-ೈೊ-್ೕೖೢೣ೦-೯ഁ-ഃാ-ൄെ-ൈൊ-്ൗൢൣ൦-൯ංඃ්ා-ුූෘ-ෟ෦-෯ෲෳัิ-ฺ็-๎๐-๙ັິ-ູົຼ່-ໍ໐-໙༘༙༠-༩༹༵༷༾༿ཱ-྄྆྇ྍ-ྗྙ-ྼ࿆ါ-ှ၀-၉ၖ-ၙၞ-ၠၢ-ၤၧ-ၭၱ-ၴႂ-ႍႏ-ႝ፝-፟፩-፱ᜒ-᜔ᜲ-᜴ᝒᝓᝲᝳ឴-៓៝០-៩᠋-᠍᠐-᠙ᢩᤠ-ᤫᤰ-᤻᥆-᥏ᦰ-ᧀᧈᧉ᧐-᧚ᨗ-ᨛᩕ-ᩞ᩠-᩿᩼-᪉᪐-᪙᪰-᪽ᬀ-ᬄ᬴-᭄᭐-᭙᭫-᭳ᮀ-ᮂᮡ-ᮭ᮰-᮹᯦-᯳ᰤ-᰷᱀-᱉᱐-᱙᳐-᳔᳒-᳨᳭ᳲ-᳴᳸᳹᷀-᷵᷼-᷿‿⁀⁔⃐-⃥⃜⃡-⃰⳯-⵿⳱ⷠ-〪ⷿ-゙゚〯꘠-꘩꙯ꙴ-꙽ꚟ꛰꛱ꠂ꠆ꠋꠣ-ꠧꢀꢁꢴ-꣄꣐-꣙꣠-꣱꤀-꤉ꤦ-꤭ꥇ-꥓ꦀ-ꦃ꦳-꧀꧐-꧙ꧥ꧰-꧹ꨩ-ꨶꩃꩌꩍ꩐-꩙ꩻ-ꩽꪰꪲ-ꪴꪷꪸꪾ꪿꫁ꫫ-ꫯꫵ꫶ꯣ-ꯪ꯬꯭꯰-꯹ﬞ︀-️︠-︭︳︴﹍-﹏０-９＿";
+
+var nonASCIIidentifierStart = new RegExp("[" + nonASCIIidentifierStartChars + "]");
+var nonASCIIidentifier = new RegExp("[" + nonASCIIidentifierStartChars + nonASCIIidentifierChars + "]");
+
+nonASCIIidentifierStartChars = nonASCIIidentifierChars = null;
+
+// These are a run-length and offset encoded representation of the
+// >0xffff code points that are a valid part of identifiers. The
+// offset starts at 0x10000, and each pair of numbers represents an
+// offset to the next range, and then a size of the range. They were
+// generated by tools/generate-identifier-regex.js
+var astralIdentifierStartCodes = [0, 11, 2, 25, 2, 18, 2, 1, 2, 14, 3, 13, 35, 122, 70, 52, 268, 28, 4, 48, 48, 31, 17, 26, 6, 37, 11, 29, 3, 35, 5, 7, 2, 4, 43, 157, 99, 39, 9, 51, 157, 310, 10, 21, 11, 7, 153, 5, 3, 0, 2, 43, 2, 1, 4, 0, 3, 22, 11, 22, 10, 30, 98, 21, 11, 25, 71, 55, 7, 1, 65, 0, 16, 3, 2, 2, 2, 26, 45, 28, 4, 28, 36, 7, 2, 27, 28, 53, 11, 21, 11, 18, 14, 17, 111, 72, 955, 52, 76, 44, 33, 24, 27, 35, 42, 34, 4, 0, 13, 47, 15, 3, 22, 0, 38, 17, 2, 24, 133, 46, 39, 7, 3, 1, 3, 21, 2, 6, 2, 1, 2, 4, 4, 0, 32, 4, 287, 47, 21, 1, 2, 0, 185, 46, 82, 47, 21, 0, 60, 42, 502, 63, 32, 0, 449, 56, 1288, 920, 104, 110, 2962, 1070, 13266, 568, 8, 30, 114, 29, 19, 47, 17, 3, 32, 20, 6, 18, 881, 68, 12, 0, 67, 12, 16481, 1, 3071, 106, 6, 12, 4, 8, 8, 9, 5991, 84, 2, 70, 2, 1, 3, 0, 3, 1, 3, 3, 2, 11, 2, 0, 2, 6, 2, 64, 2, 3, 3, 7, 2, 6, 2, 27, 2, 3, 2, 4, 2, 0, 4, 6, 2, 339, 3, 24, 2, 24, 2, 30, 2, 24, 2, 30, 2, 24, 2, 30, 2, 24, 2, 30, 2, 24, 2, 7, 4149, 196, 1340, 3, 2, 26, 2, 1, 2, 0, 3, 0, 2, 9, 2, 3, 2, 0, 2, 0, 7, 0, 5, 0, 2, 0, 2, 0, 2, 2, 2, 1, 2, 0, 3, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 1, 2, 0, 3, 3, 2, 6, 2, 3, 2, 3, 2, 0, 2, 9, 2, 16, 6, 2, 2, 4, 2, 16, 4421, 42710, 42, 4148, 12, 221, 16355, 541];
+var astralIdentifierCodes = [509, 0, 227, 0, 150, 4, 294, 9, 1368, 2, 2, 1, 6, 3, 41, 2, 5, 0, 166, 1, 1306, 2, 54, 14, 32, 9, 16, 3, 46, 10, 54, 9, 7, 2, 37, 13, 2, 9, 52, 0, 13, 2, 49, 13, 16, 9, 83, 11, 168, 11, 6, 9, 8, 2, 57, 0, 2, 6, 3, 1, 3, 2, 10, 0, 11, 1, 3, 6, 4, 4, 316, 19, 13, 9, 214, 6, 3, 8, 112, 16, 16, 9, 82, 12, 9, 9, 535, 9, 20855, 9, 135, 4, 60, 6, 26, 9, 1016, 45, 17, 3, 19723, 1, 5319, 4, 4, 5, 9, 7, 3, 6, 31, 3, 149, 2, 1418, 49, 4305, 6, 792618, 239];
+
+// This has a complexity linear to the value of the code. The
+// assumption is that looking up astral identifier characters is
+// rare.
+function isInAstralSet(code, set) {
+  var pos = 0x10000;
+  for (var i = 0; i < set.length; i += 2) {
+    pos += set[i];
+    if (pos > code) return false;
+    pos += set[i + 1];
+    if (pos >= code) return true;
+  }
+}
+
+// Test whether a given character code starts an identifier.
+
+function isIdentifierStart(code, astral) {
+  if (code < 65) return code === 36;
+  if (code < 91) return true;
+  if (code < 97) return code === 95;
+  if (code < 123) return true;
+  if (code <= 0xffff) return code >= 0xaa && nonASCIIidentifierStart.test(String.fromCharCode(code));
+  if (astral === false) return false;
+  return isInAstralSet(code, astralIdentifierStartCodes);
+}
+
+// Test whether a given character is part of an identifier.
+
+function isIdentifierChar(code, astral) {
+  if (code < 48) return code === 36;
+  if (code < 58) return true;
+  if (code < 65) return false;
+  if (code < 91) return true;
+  if (code < 97) return code === 95;
+  if (code < 123) return true;
+  if (code <= 0xffff) return code >= 0xaa && nonASCIIidentifier.test(String.fromCharCode(code));
+  if (astral === false) return false;
+  return isInAstralSet(code, astralIdentifierStartCodes) || isInAstralSet(code, astralIdentifierCodes);
+}
+
+},{}],3:[function(_dereq_,module,exports){
+// Acorn is a tiny, fast JavaScript parser written in JavaScript.
+//
+// Acorn was written by Marijn Haverbeke, Ingvar Stepanyan, and
+// various contributors and released under an MIT license.
+//
+// Git repositories for Acorn are available at
+//
+//     http://marijnhaverbeke.nl/git/acorn
+//     https://github.com/ternjs/acorn.git
+//
+// Please use the [github bug tracker][ghbt] to report issues.
+//
+// [ghbt]: https://github.com/ternjs/acorn/issues
+//
+// This file defines the main parser interface. The library also comes
+// with a [error-tolerant parser][dammit] and an
+// [abstract syntax tree walker][walk], defined in other files.
+//
+// [dammit]: acorn_loose.js
+// [walk]: util/walk.js
+
+"use strict";
+
+exports.__esModule = true;
+exports.parse = parse;
+exports.parseExpressionAt = parseExpressionAt;
+exports.tokenizer = tokenizer;
+
+var _state = _dereq_("./state");
+
+_dereq_("./parseutil");
+
+_dereq_("./statement");
+
+_dereq_("./lval");
+
+_dereq_("./expression");
+
+_dereq_("./location");
+
+exports.Parser = _state.Parser;
+exports.plugins = _state.plugins;
+
+var _options = _dereq_("./options");
+
+exports.defaultOptions = _options.defaultOptions;
+
+var _locutil = _dereq_("./locutil");
+
+exports.Position = _locutil.Position;
+exports.SourceLocation = _locutil.SourceLocation;
+exports.getLineInfo = _locutil.getLineInfo;
+
+var _node = _dereq_("./node");
+
+exports.Node = _node.Node;
+
+var _tokentype = _dereq_("./tokentype");
+
+exports.TokenType = _tokentype.TokenType;
+exports.tokTypes = _tokentype.types;
+
+var _tokencontext = _dereq_("./tokencontext");
+
+exports.TokContext = _tokencontext.TokContext;
+exports.tokContexts = _tokencontext.types;
+
+var _identifier = _dereq_("./identifier");
+
+exports.isIdentifierChar = _identifier.isIdentifierChar;
+exports.isIdentifierStart = _identifier.isIdentifierStart;
+
+var _tokenize = _dereq_("./tokenize");
+
+exports.Token = _tokenize.Token;
+
+var _whitespace = _dereq_("./whitespace");
+
+exports.isNewLine = _whitespace.isNewLine;
+exports.lineBreak = _whitespace.lineBreak;
+exports.lineBreakG = _whitespace.lineBreakG;
+var version = "2.6.4";
+
+exports.version = version;
+// The main exported interface (under `self.acorn` when in the
+// browser) is a `parse` function that takes a code string and
+// returns an abstract syntax tree as specified by [Mozilla parser
+// API][api].
+//
+// [api]: https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API
+
+function parse(input, options) {
+  return new _state.Parser(options, input).parse();
+}
+
+// This function tries to parse a single expression at a given
+// offset in a string. Useful for parsing mixed-language formats
+// that embed JavaScript expressions.
+
+function parseExpressionAt(input, pos, options) {
+  var p = new _state.Parser(options, input, pos);
+  p.nextToken();
+  return p.parseExpression();
+}
+
+// Acorn is organized as a tokenizer and a recursive-descent parser.
+// The `tokenizer` export provides an interface to the tokenizer.
+
+function tokenizer(input, options) {
+  return new _state.Parser(options, input);
+}
+
+},{"./expression":1,"./identifier":2,"./location":4,"./locutil":5,"./lval":6,"./node":7,"./options":8,"./parseutil":9,"./state":10,"./statement":11,"./tokencontext":12,"./tokenize":13,"./tokentype":14,"./whitespace":16}],4:[function(_dereq_,module,exports){
+"use strict";
+
+var _state = _dereq_("./state");
+
+var _locutil = _dereq_("./locutil");
+
+var pp = _state.Parser.prototype;
+
+// This function is used to raise exceptions on parse errors. It
+// takes an offset integer (into the current `input`) to indicate
+// the location of the error, attaches the position to the end
+// of the error message, and then raises a `SyntaxError` with that
+// message.
+
+pp.raise = function (pos, message) {
+  var loc = _locutil.getLineInfo(this.input, pos);
+  message += " (" + loc.line + ":" + loc.column + ")";
+  var err = new SyntaxError(message);
+  err.pos = pos;err.loc = loc;err.raisedAt = this.pos;
+  throw err;
+};
+
+pp.curPosition = function () {
+  if (this.options.locations) {
+    return new _locutil.Position(this.curLine, this.pos - this.lineStart);
+  }
+};
+
+},{"./locutil":5,"./state":10}],5:[function(_dereq_,module,exports){
+"use strict";
+
+exports.__esModule = true;
+exports.getLineInfo = getLineInfo;
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+var _whitespace = _dereq_("./whitespace");
+
+// These are used when `options.locations` is on, for the
+// `startLoc` and `endLoc` properties.
+
+var Position = (function () {
+  function Position(line, col) {
+    _classCallCheck(this, Position);
+
+    this.line = line;
+    this.column = col;
+  }
+
+  Position.prototype.offset = function offset(n) {
+    return new Position(this.line, this.column + n);
+  };
+
+  return Position;
+})();
+
+exports.Position = Position;
+
+var SourceLocation = function SourceLocation(p, start, end) {
+  _classCallCheck(this, SourceLocation);
+
+  this.start = start;
+  this.end = end;
+  if (p.sourceFile !== null) this.source = p.sourceFile;
+}
+
+// The `getLineInfo` function is mostly useful when the
+// `locations` option is off (for performance reasons) and you
+// want to find the line/column position for a given character
+// offset. `input` should be the code string that the offset refers
+// into.
+
+;
+
+exports.SourceLocation = SourceLocation;
+
+function getLineInfo(input, offset) {
+  for (var line = 1, cur = 0;;) {
+    _whitespace.lineBreakG.lastIndex = cur;
+    var match = _whitespace.lineBreakG.exec(input);
+    if (match && match.index < offset) {
+      ++line;
+      cur = match.index + match[0].length;
+    } else {
+      return new Position(line, offset - cur);
+    }
+  }
+}
+
+},{"./whitespace":16}],6:[function(_dereq_,module,exports){
+"use strict";
+
+var _tokentype = _dereq_("./tokentype");
+
+var _state = _dereq_("./state");
+
+var _util = _dereq_("./util");
+
+var pp = _state.Parser.prototype;
+
+// Convert existing expression atom to assignable pattern
+// if possible.
+
+pp.toAssignable = function (node, isBinding) {
+  if (this.options.ecmaVersion >= 6 && node) {
+    switch (node.type) {
+      case "Identifier":
+      case "ObjectPattern":
+      case "ArrayPattern":
+        break;
+
+      case "ObjectExpression":
+        node.type = "ObjectPattern";
+        for (var i = 0; i < node.properties.length; i++) {
+          var prop = node.properties[i];
+          if (prop.kind !== "init") this.raise(prop.key.start, "Object pattern can't contain getter or setter");
+          this.toAssignable(prop.value, isBinding);
+        }
+        break;
+
+      case "ArrayExpression":
+        node.type = "ArrayPattern";
+        this.toAssignableList(node.elements, isBinding);
+        break;
+
+      case "AssignmentExpression":
+        if (node.operator === "=") {
+          node.type = "AssignmentPattern";
+          delete node.operator;
+          // falls through to AssignmentPattern
+        } else {
+            this.raise(node.left.end, "Only '=' operator can be used for specifying default value.");
+            break;
+          }
+
+      case "AssignmentPattern":
+        if (node.right.type === "YieldExpression") this.raise(node.right.start, "Yield expression cannot be a default value");
+        break;
+
+      case "ParenthesizedExpression":
+        node.expression = this.toAssignable(node.expression, isBinding);
+        break;
+
+      case "MemberExpression":
+        if (!isBinding) break;
+
+      default:
+        this.raise(node.start, "Assigning to rvalue");
+    }
+  }
+  return node;
+};
+
+// Convert list of expression atoms to binding list.
+
+pp.toAssignableList = function (exprList, isBinding) {
+  var end = exprList.length;
+  if (end) {
+    var last = exprList[end - 1];
+    if (last && last.type == "RestElement") {
+      --end;
+    } else if (last && last.type == "SpreadElement") {
+      last.type = "RestElement";
+      var arg = last.argument;
+      this.toAssignable(arg, isBinding);
+      if (arg.type !== "Identifier" && arg.type !== "MemberExpression" && arg.type !== "ArrayPattern") this.unexpected(arg.start);
+      --end;
+    }
+
+    if (isBinding && last.type === "RestElement" && last.argument.type !== "Identifier") this.unexpected(last.argument.start);
+  }
+  for (var i = 0; i < end; i++) {
+    var elt = exprList[i];
+    if (elt) this.toAssignable(elt, isBinding);
+  }
+  return exprList;
+};
+
+// Parses spread element.
+
+pp.parseSpread = function (refDestructuringErrors) {
+  var node = this.startNode();
+  this.next();
+  node.argument = this.parseMaybeAssign(refDestructuringErrors);
+  return this.finishNode(node, "SpreadElement");
+};
+
+pp.parseRest = function (allowNonIdent) {
+  var node = this.startNode();
+  this.next();
+
+  // RestElement inside of a function parameter must be an identifier
+  if (allowNonIdent) node.argument = this.type === _tokentype.types.name ? this.parseIdent() : this.unexpected();else node.argument = this.type === _tokentype.types.name || this.type === _tokentype.types.bracketL ? this.parseBindingAtom() : this.unexpected();
+
+  return this.finishNode(node, "RestElement");
+};
+
+// Parses lvalue (assignable) atom.
+
+pp.parseBindingAtom = function () {
+  if (this.options.ecmaVersion < 6) return this.parseIdent();
+  switch (this.type) {
+    case _tokentype.types.name:
+      return this.parseIdent();
+
+    case _tokentype.types.bracketL:
+      var node = this.startNode();
+      this.next();
+      node.elements = this.parseBindingList(_tokentype.types.bracketR, true, true);
+      return this.finishNode(node, "ArrayPattern");
+
+    case _tokentype.types.braceL:
+      return this.parseObj(true);
+
+    default:
+      this.unexpected();
+  }
+};
+
+pp.parseBindingList = function (close, allowEmpty, allowTrailingComma, allowNonIdent) {
+  var elts = [],
+      first = true;
+  while (!this.eat(close)) {
+    if (first) first = false;else this.expect(_tokentype.types.comma);
+    if (allowEmpty && this.type === _tokentype.types.comma) {
+      elts.push(null);
+    } else if (allowTrailingComma && this.afterTrailingComma(close)) {
+      break;
+    } else if (this.type === _tokentype.types.ellipsis) {
+      var rest = this.parseRest(allowNonIdent);
+      this.parseBindingListItem(rest);
+      elts.push(rest);
+      this.expect(close);
+      break;
+    } else {
+      var elem = this.parseMaybeDefault(this.start, this.startLoc);
+      this.parseBindingListItem(elem);
+      elts.push(elem);
+    }
+  }
+  return elts;
+};
+
+pp.parseBindingListItem = function (param) {
+  return param;
+};
+
+// Parses assignment pattern around given atom if possible.
+
+pp.parseMaybeDefault = function (startPos, startLoc, left) {
+  left = left || this.parseBindingAtom();
+  if (this.options.ecmaVersion < 6 || !this.eat(_tokentype.types.eq)) return left;
+  var node = this.startNodeAt(startPos, startLoc);
+  node.left = left;
+  node.right = this.parseMaybeAssign();
+  return this.finishNode(node, "AssignmentPattern");
+};
+
+// Verify that a node is an lval — something that can be assigned
+// to.
+
+pp.checkLVal = function (expr, isBinding, checkClashes) {
+  switch (expr.type) {
+    case "Identifier":
+      if (this.strict && this.reservedWordsStrictBind.test(expr.name)) this.raise(expr.start, (isBinding ? "Binding " : "Assigning to ") + expr.name + " in strict mode");
+      if (checkClashes) {
+        if (_util.has(checkClashes, expr.name)) this.raise(expr.start, "Argument name clash");
+        checkClashes[expr.name] = true;
+      }
+      break;
+
+    case "MemberExpression":
+      if (isBinding) this.raise(expr.start, (isBinding ? "Binding" : "Assigning to") + " member expression");
+      break;
+
+    case "ObjectPattern":
+      for (var i = 0; i < expr.properties.length; i++) {
+        this.checkLVal(expr.properties[i].value, isBinding, checkClashes);
+      }break;
+
+    case "ArrayPattern":
+      for (var i = 0; i < expr.elements.length; i++) {
+        var elem = expr.elements[i];
+        if (elem) this.checkLVal(elem, isBinding, checkClashes);
+      }
+      break;
+
+    case "AssignmentPattern":
+      this.checkLVal(expr.left, isBinding, checkClashes);
+      break;
+
+    case "RestElement":
+      this.checkLVal(expr.argument, isBinding, checkClashes);
+      break;
+
+    case "ParenthesizedExpression":
+      this.checkLVal(expr.expression, isBinding, checkClashes);
+      break;
+
+    default:
+      this.raise(expr.start, (isBinding ? "Binding" : "Assigning to") + " rvalue");
+  }
+};
+
+},{"./state":10,"./tokentype":14,"./util":15}],7:[function(_dereq_,module,exports){
+"use strict";
+
+exports.__esModule = true;
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+var _state = _dereq_("./state");
+
+var _locutil = _dereq_("./locutil");
+
+var Node = function Node(parser, pos, loc) {
+  _classCallCheck(this, Node);
+
+  this.type = "";
+  this.start = pos;
+  this.end = 0;
+  if (parser.options.locations) this.loc = new _locutil.SourceLocation(parser, loc);
+  if (parser.options.directSourceFile) this.sourceFile = parser.options.directSourceFile;
+  if (parser.options.ranges) this.range = [pos, 0];
+}
+
+// Start an AST node, attaching a start offset.
+
+;
+
+exports.Node = Node;
+var pp = _state.Parser.prototype;
+
+pp.startNode = function () {
+  return new Node(this, this.start, this.startLoc);
+};
+
+pp.startNodeAt = function (pos, loc) {
+  return new Node(this, pos, loc);
+};
+
+// Finish an AST node, adding `type` and `end` properties.
+
+function finishNodeAt(node, type, pos, loc) {
+  node.type = type;
+  node.end = pos;
+  if (this.options.locations) node.loc.end = loc;
+  if (this.options.ranges) node.range[1] = pos;
+  return node;
+}
+
+pp.finishNode = function (node, type) {
+  return finishNodeAt.call(this, node, type, this.lastTokEnd, this.lastTokEndLoc);
+};
+
+// Finish node at given position
+
+pp.finishNodeAt = function (node, type, pos, loc) {
+  return finishNodeAt.call(this, node, type, pos, loc);
+};
+
+},{"./locutil":5,"./state":10}],8:[function(_dereq_,module,exports){
+"use strict";
+
+exports.__esModule = true;
+exports.getOptions = getOptions;
+
+var _util = _dereq_("./util");
+
+var _locutil = _dereq_("./locutil");
+
+// A second optional argument can be given to further configure
+// the parser process. These options are recognized:
+
+var defaultOptions = {
+  // `ecmaVersion` indicates the ECMAScript version to parse. Must
+  // be either 3, or 5, or 6. This influences support for strict
+  // mode, the set of reserved words, support for getters and
+  // setters and other features.
+  ecmaVersion: 5,
+  // Source type ("script" or "module") for different semantics
+  sourceType: "script",
+  // `onInsertedSemicolon` can be a callback that will be called
+  // when a semicolon is automatically inserted. It will be passed
+  // th position of the comma as an offset, and if `locations` is
+  // enabled, it is given the location as a `{line, column}` object
+  // as second argument.
+  onInsertedSemicolon: null,
+  // `onTrailingComma` is similar to `onInsertedSemicolon`, but for
+  // trailing commas.
+  onTrailingComma: null,
+  // By default, reserved words are only enforced if ecmaVersion >= 5.
+  // Set `allowReserved` to a boolean value to explicitly turn this on
+  // an off. When this option has the value "never", reserved words
+  // and keywords can also not be used as property names.
+  allowReserved: null,
+  // When enabled, a return at the top level is not considered an
+  // error.
+  allowReturnOutsideFunction: false,
+  // When enabled, import/export statements are not constrained to
+  // appearing at the top of the program.
+  allowImportExportEverywhere: false,
+  // When enabled, hashbang directive in the beginning of file
+  // is allowed and treated as a line comment.
+  allowHashBang: false,
+  // When `locations` is on, `loc` properties holding objects with
+  // `start` and `end` properties in `{line, column}` form (with
+  // line being 1-based and column 0-based) will be attached to the
+  // nodes.
+  locations: false,
+  // A function can be passed as `onToken` option, which will
+  // cause Acorn to call that function with object in the same
+  // format as tokens returned from `tokenizer().getToken()`. Note
+  // that you are not allowed to call the parser from the
+  // callback—that will corrupt its internal state.
+  onToken: null,
+  // A function can be passed as `onComment` option, which will
+  // cause Acorn to call that function with `(block, text, start,
+  // end)` parameters whenever a comment is skipped. `block` is a
+  // boolean indicating whether this is a block (`/* */`) comment,
+  // `text` is the content of the comment, and `start` and `end` are
+  // character offsets that denote the start and end of the comment.
+  // When the `locations` option is on, two more parameters are
+  // passed, the full `{line, column}` locations of the start and
+  // end of the comments. Note that you are not allowed to call the
+  // parser from the callback—that will corrupt its internal state.
+  onComment: null,
+  // Nodes have their start and end characters offsets recorded in
+  // `start` and `end` properties (directly on the node, rather than
+  // the `loc` object, which holds line/column data. To also add a
+  // [semi-standardized][range] `range` property holding a `[start,
+  // end]` array with the same numbers, set the `ranges` option to
+  // `true`.
+  //
+  // [range]: https://bugzilla.mozilla.org/show_bug.cgi?id=745678
+  ranges: false,
+  // It is possible to parse multiple files into a single AST by
+  // passing the tree produced by parsing the first file as
+  // `program` option in subsequent parses. This will add the
+  // toplevel forms of the parsed file to the `Program` (top) node
+  // of an existing parse tree.
+  program: null,
+  // When `locations` is on, you can pass this to record the source
+  // file in every node's `loc` object.
+  sourceFile: null,
+  // This value, if given, is stored in every node, whether
+  // `locations` is on or off.
+  directSourceFile: null,
+  // When enabled, parenthesized expressions are represented by
+  // (non-standard) ParenthesizedExpression nodes
+  preserveParens: false,
+  plugins: {}
+};
+
+exports.defaultOptions = defaultOptions;
+// Interpret and default an options object
+
+function getOptions(opts) {
+  var options = {};
+  for (var opt in defaultOptions) {
+    options[opt] = opts && _util.has(opts, opt) ? opts[opt] : defaultOptions[opt];
+  }if (options.allowReserved == null) options.allowReserved = options.ecmaVersion < 5;
+
+  if (_util.isArray(options.onToken)) {
+    (function () {
+      var tokens = options.onToken;
+      options.onToken = function (token) {
+        return tokens.push(token);
+      };
+    })();
+  }
+  if (_util.isArray(options.onComment)) options.onComment = pushComment(options, options.onComment);
+
+  return options;
+}
+
+function pushComment(options, array) {
+  return function (block, text, start, end, startLoc, endLoc) {
+    var comment = {
+      type: block ? 'Block' : 'Line',
+      value: text,
+      start: start,
+      end: end
+    };
+    if (options.locations) comment.loc = new _locutil.SourceLocation(this, startLoc, endLoc);
+    if (options.ranges) comment.range = [start, end];
+    array.push(comment);
+  };
+}
+
+},{"./locutil":5,"./util":15}],9:[function(_dereq_,module,exports){
+"use strict";
+
+var _tokentype = _dereq_("./tokentype");
+
+var _state = _dereq_("./state");
+
+var _whitespace = _dereq_("./whitespace");
+
+var pp = _state.Parser.prototype;
+
+// ## Parser utilities
+
+// Test whether a statement node is the string literal `"use strict"`.
+
+pp.isUseStrict = function (stmt) {
+  return this.options.ecmaVersion >= 5 && stmt.type === "ExpressionStatement" && stmt.expression.type === "Literal" && stmt.expression.raw.slice(1, -1) === "use strict";
+};
+
+// Predicate that tests whether the next token is of the given
+// type, and if yes, consumes it as a side effect.
+
+pp.eat = function (type) {
+  if (this.type === type) {
+    this.next();
+    return true;
+  } else {
+    return false;
+  }
+};
+
+// Tests whether parsed token is a contextual keyword.
+
+pp.isContextual = function (name) {
+  return this.type === _tokentype.types.name && this.value === name;
+};
+
+// Consumes contextual keyword if possible.
+
+pp.eatContextual = function (name) {
+  return this.value === name && this.eat(_tokentype.types.name);
+};
+
+// Asserts that following token is given contextual keyword.
+
+pp.expectContextual = function (name) {
+  if (!this.eatContextual(name)) this.unexpected();
+};
+
+// Test whether a semicolon can be inserted at the current position.
+
+pp.canInsertSemicolon = function () {
+  return this.type === _tokentype.types.eof || this.type === _tokentype.types.braceR || _whitespace.lineBreak.test(this.input.slice(this.lastTokEnd, this.start));
+};
+
+pp.insertSemicolon = function () {
+  if (this.canInsertSemicolon()) {
+    if (this.options.onInsertedSemicolon) this.options.onInsertedSemicolon(this.lastTokEnd, this.lastTokEndLoc);
+    return true;
+  }
+};
+
+// Consume a semicolon, or, failing that, see if we are allowed to
+// pretend that there is a semicolon at this position.
+
+pp.semicolon = function () {
+  if (!this.eat(_tokentype.types.semi) && !this.insertSemicolon()) this.unexpected();
+};
+
+pp.afterTrailingComma = function (tokType) {
+  if (this.type == tokType) {
+    if (this.options.onTrailingComma) this.options.onTrailingComma(this.lastTokStart, this.lastTokStartLoc);
+    this.next();
+    return true;
+  }
+};
+
+// Expect a token of a given type. If found, consume it, otherwise,
+// raise an unexpected token error.
+
+pp.expect = function (type) {
+  this.eat(type) || this.unexpected();
+};
+
+// Raise an unexpected token error.
+
+pp.unexpected = function (pos) {
+  this.raise(pos != null ? pos : this.start, "Unexpected token");
+};
+
+pp.checkPatternErrors = function (refDestructuringErrors, andThrow) {
+  var pos = refDestructuringErrors && refDestructuringErrors.trailingComma;
+  if (!andThrow) return !!pos;
+  if (pos) this.raise(pos, "Trailing comma is not permitted in destructuring patterns");
+};
+
+pp.checkExpressionErrors = function (refDestructuringErrors, andThrow) {
+  var pos = refDestructuringErrors && refDestructuringErrors.shorthandAssign;
+  if (!andThrow) return !!pos;
+  if (pos) this.raise(pos, "Shorthand property assignments are valid only in destructuring patterns");
+};
+
+},{"./state":10,"./tokentype":14,"./whitespace":16}],10:[function(_dereq_,module,exports){
+"use strict";
+
+exports.__esModule = true;
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+var _identifier = _dereq_("./identifier");
+
+var _tokentype = _dereq_("./tokentype");
+
+var _whitespace = _dereq_("./whitespace");
+
+var _options = _dereq_("./options");
+
+// Registered plugins
+var plugins = {};
+
+exports.plugins = plugins;
+function keywordRegexp(words) {
+  return new RegExp("^(" + words.replace(/ /g, "|") + ")$");
+}
+
+var Parser = (function () {
+  function Parser(options, input, startPos) {
+    _classCallCheck(this, Parser);
+
+    this.options = options = _options.getOptions(options);
+    this.sourceFile = options.sourceFile;
+    this.keywords = keywordRegexp(_identifier.keywords[options.ecmaVersion >= 6 ? 6 : 5]);
+    var reserved = options.allowReserved ? "" : _identifier.reservedWords[options.ecmaVersion] + (options.sourceType == "module" ? " await" : "");
+    this.reservedWords = keywordRegexp(reserved);
+    var reservedStrict = (reserved ? reserved + " " : "") + _identifier.reservedWords.strict;
+    this.reservedWordsStrict = keywordRegexp(reservedStrict);
+    this.reservedWordsStrictBind = keywordRegexp(reservedStrict + " " + _identifier.reservedWords.strictBind);
+    this.input = String(input);
+
+    // Used to signal to callers of `readWord1` whether the word
+    // contained any escape sequences. This is needed because words with
+    // escape sequences must not be interpreted as keywords.
+    this.containsEsc = false;
+
+    // Load plugins
+    this.loadPlugins(options.plugins);
+
+    // Set up token state
+
+    // The current position of the tokenizer in the input.
+    if (startPos) {
+      this.pos = startPos;
+      this.lineStart = Math.max(0, this.input.lastIndexOf("\n", startPos));
+      this.curLine = this.input.slice(0, this.lineStart).split(_whitespace.lineBreak).length;
+    } else {
+      this.pos = this.lineStart = 0;
+      this.curLine = 1;
+    }
+
+    // Properties of the current token:
+    // Its type
+    this.type = _tokentype.types.eof;
+    // For tokens that include more information than their type, the value
+    this.value = null;
+    // Its start and end offset
+    this.start = this.end = this.pos;
+    // And, if locations are used, the {line, column} object
+    // corresponding to those offsets
+    this.startLoc = this.endLoc = this.curPosition();
+
+    // Position information for the previous token
+    this.lastTokEndLoc = this.lastTokStartLoc = null;
+    this.lastTokStart = this.lastTokEnd = this.pos;
+
+    // The context stack is used to superficially track syntactic
+    // context to predict whether a regular expression is allowed in a
+    // given position.
+    this.context = this.initialContext();
+    this.exprAllowed = true;
+
+    // Figure out if it's a module code.
+    this.strict = this.inModule = options.sourceType === "module";
+
+    // Used to signify the start of a potential arrow function
+    this.potentialArrowAt = -1;
+
+    // Flags to track whether we are in a function, a generator.
+    this.inFunction = this.inGenerator = false;
+    // Labels in scope.
+    this.labels = [];
+
+    // If enabled, skip leading hashbang line.
+    if (this.pos === 0 && options.allowHashBang && this.input.slice(0, 2) === '#!') this.skipLineComment(2);
+  }
+
+  // DEPRECATED Kept for backwards compatibility until 3.0 in case a plugin uses them
+
+  Parser.prototype.isKeyword = function isKeyword(word) {
+    return this.keywords.test(word);
+  };
+
+  Parser.prototype.isReservedWord = function isReservedWord(word) {
+    return this.reservedWords.test(word);
+  };
+
+  Parser.prototype.extend = function extend(name, f) {
+    this[name] = f(this[name]);
+  };
+
+  Parser.prototype.loadPlugins = function loadPlugins(pluginConfigs) {
+    for (var _name in pluginConfigs) {
+      var plugin = plugins[_name];
+      if (!plugin) throw new Error("Plugin '" + _name + "' not found");
+      plugin(this, pluginConfigs[_name]);
+    }
+  };
+
+  Parser.prototype.parse = function parse() {
+    var node = this.options.program || this.startNode();
+    this.nextToken();
+    return this.parseTopLevel(node);
+  };
+
+  return Parser;
+})();
+
+exports.Parser = Parser;
+
+},{"./identifier":2,"./options":8,"./tokentype":14,"./whitespace":16}],11:[function(_dereq_,module,exports){
+"use strict";
+
+var _tokentype = _dereq_("./tokentype");
+
+var _state = _dereq_("./state");
+
+var _whitespace = _dereq_("./whitespace");
+
+var pp = _state.Parser.prototype;
+
+// ### Statement parsing
+
+// Parse a program. Initializes the parser, reads any number of
+// statements, and wraps them in a Program node.  Optionally takes a
+// `program` argument.  If present, the statements will be appended
+// to its body instead of creating a new node.
+
+pp.parseTopLevel = function (node) {
+  var first = true;
+  if (!node.body) node.body = [];
+  while (this.type !== _tokentype.types.eof) {
+    var stmt = this.parseStatement(true, true);
+    node.body.push(stmt);
+    if (first) {
+      if (this.isUseStrict(stmt)) this.setStrict(true);
+      first = false;
+    }
+  }
+  this.next();
+  if (this.options.ecmaVersion >= 6) {
+    node.sourceType = this.options.sourceType;
+  }
+  return this.finishNode(node, "Program");
+};
+
+var loopLabel = { kind: "loop" },
+    switchLabel = { kind: "switch" };
+
+// Parse a single statement.
+//
+// If expecting a statement and finding a slash operator, parse a
+// regular expression literal. This is to handle cases like
+// `if (foo) /blah/.exec(foo)`, where looking at the previous token
+// does not help.
+
+pp.parseStatement = function (declaration, topLevel) {
+  var starttype = this.type,
+      node = this.startNode();
+
+  // Most types of statements are recognized by the keyword they
+  // start with. Many are trivial to parse, some require a bit of
+  // complexity.
+
+  switch (starttype) {
+    case _tokentype.types._break:case _tokentype.types._continue:
+      return this.parseBreakContinueStatement(node, starttype.keyword);
+    case _tokentype.types._debugger:
+      return this.parseDebuggerStatement(node);
+    case _tokentype.types._do:
+      return this.parseDoStatement(node);
+    case _tokentype.types._for:
+      return this.parseForStatement(node);
+    case _tokentype.types._function:
+      if (!declaration && this.options.ecmaVersion >= 6) this.unexpected();
+      return this.parseFunctionStatement(node);
+    case _tokentype.types._class:
+      if (!declaration) this.unexpected();
+      return this.parseClass(node, true);
+    case _tokentype.types._if:
+      return this.parseIfStatement(node);
+    case _tokentype.types._return:
+      return this.parseReturnStatement(node);
+    case _tokentype.types._switch:
+      return this.parseSwitchStatement(node);
+    case _tokentype.types._throw:
+      return this.parseThrowStatement(node);
+    case _tokentype.types._try:
+      return this.parseTryStatement(node);
+    case _tokentype.types._let:case _tokentype.types._const:
+      if (!declaration) this.unexpected(); // NOTE: falls through to _var
+    case _tokentype.types._var:
+      return this.parseVarStatement(node, starttype);
+    case _tokentype.types._while:
+      return this.parseWhileStatement(node);
+    case _tokentype.types._with:
+      return this.parseWithStatement(node);
+    case _tokentype.types.braceL:
+      return this.parseBlock();
+    case _tokentype.types.semi:
+      return this.parseEmptyStatement(node);
+    case _tokentype.types._export:
+    case _tokentype.types._import:
+      if (!this.options.allowImportExportEverywhere) {
+        if (!topLevel) this.raise(this.start, "'import' and 'export' may only appear at the top level");
+        if (!this.inModule) this.raise(this.start, "'import' and 'export' may appear only with 'sourceType: module'");
+      }
+      return starttype === _tokentype.types._import ? this.parseImport(node) : this.parseExport(node);
+
+    // If the statement does not start with a statement keyword or a
+    // brace, it's an ExpressionStatement or LabeledStatement. We
+    // simply start parsing an expression, and afterwards, if the
+    // next token is a colon and the expression was a simple
+    // Identifier node, we switch to interpreting it as a label.
+    default:
+      var maybeName = this.value,
+          expr = this.parseExpression();
+      if (starttype === _tokentype.types.name && expr.type === "Identifier" && this.eat(_tokentype.types.colon)) return this.parseLabeledStatement(node, maybeName, expr);else return this.parseExpressionStatement(node, expr);
+  }
+};
+
+pp.parseBreakContinueStatement = function (node, keyword) {
+  var isBreak = keyword == "break";
+  this.next();
+  if (this.eat(_tokentype.types.semi) || this.insertSemicolon()) node.label = null;else if (this.type !== _tokentype.types.name) this.unexpected();else {
+    node.label = this.parseIdent();
+    this.semicolon();
+  }
+
+  // Verify that there is an actual destination to break or
+  // continue to.
+  for (var i = 0; i < this.labels.length; ++i) {
+    var lab = this.labels[i];
+    if (node.label == null || lab.name === node.label.name) {
+      if (lab.kind != null && (isBreak || lab.kind === "loop")) break;
+      if (node.label && isBreak) break;
+    }
+  }
+  if (i === this.labels.length) this.raise(node.start, "Unsyntactic " + keyword);
+  return this.finishNode(node, isBreak ? "BreakStatement" : "ContinueStatement");
+};
+
+pp.parseDebuggerStatement = function (node) {
+  this.next();
+  this.semicolon();
+  return this.finishNode(node, "DebuggerStatement");
+};
+
+pp.parseDoStatement = function (node) {
+  this.next();
+  this.labels.push(loopLabel);
+  node.body = this.parseStatement(false);
+  this.labels.pop();
+  this.expect(_tokentype.types._while);
+  node.test = this.parseParenExpression();
+  if (this.options.ecmaVersion >= 6) this.eat(_tokentype.types.semi);else this.semicolon();
+  return this.finishNode(node, "DoWhileStatement");
+};
+
+// Disambiguating between a `for` and a `for`/`in` or `for`/`of`
+// loop is non-trivial. Basically, we have to parse the init `var`
+// statement or expression, disallowing the `in` operator (see
+// the second parameter to `parseExpression`), and then check
+// whether the next token is `in` or `of`. When there is no init
+// part (semicolon immediately after the opening parenthesis), it
+// is a regular `for` loop.
+
+pp.parseForStatement = function (node) {
+  this.next();
+  this.labels.push(loopLabel);
+  this.expect(_tokentype.types.parenL);
+  if (this.type === _tokentype.types.semi) return this.parseFor(node, null);
+  if (this.type === _tokentype.types._var || this.type === _tokentype.types._let || this.type === _tokentype.types._const) {
+    var _init = this.startNode(),
+        varKind = this.type;
+    this.next();
+    this.parseVar(_init, true, varKind);
+    this.finishNode(_init, "VariableDeclaration");
+    if ((this.type === _tokentype.types._in || this.options.ecmaVersion >= 6 && this.isContextual("of")) && _init.declarations.length === 1 && !(varKind !== _tokentype.types._var && _init.declarations[0].init)) return this.parseForIn(node, _init);
+    return this.parseFor(node, _init);
+  }
+  var refDestructuringErrors = { shorthandAssign: 0, trailingComma: 0 };
+  var init = this.parseExpression(true, refDestructuringErrors);
+  if (this.type === _tokentype.types._in || this.options.ecmaVersion >= 6 && this.isContextual("of")) {
+    this.checkPatternErrors(refDestructuringErrors, true);
+    this.toAssignable(init);
+    this.checkLVal(init);
+    return this.parseForIn(node, init);
+  } else {
+    this.checkExpressionErrors(refDestructuringErrors, true);
+  }
+  return this.parseFor(node, init);
+};
+
+pp.parseFunctionStatement = function (node) {
+  this.next();
+  return this.parseFunction(node, true);
+};
+
+pp.parseIfStatement = function (node) {
+  this.next();
+  node.test = this.parseParenExpression();
+  node.consequent = this.parseStatement(false);
+  node.alternate = this.eat(_tokentype.types._else) ? this.parseStatement(false) : null;
+  return this.finishNode(node, "IfStatement");
+};
+
+pp.parseReturnStatement = function (node) {
+  if (!this.inFunction && !this.options.allowReturnOutsideFunction) this.raise(this.start, "'return' outside of function");
+  this.next();
+
+  // In `return` (and `break`/`continue`), the keywords with
+  // optional arguments, we eagerly look for a semicolon or the
+  // possibility to insert one.
+
+  if (this.eat(_tokentype.types.semi) || this.insertSemicolon()) node.argument = null;else {
+    node.argument = this.parseExpression();this.semicolon();
+  }
+  return this.finishNode(node, "ReturnStatement");
+};
+
+pp.parseSwitchStatement = function (node) {
+  this.next();
+  node.discriminant = this.parseParenExpression();
+  node.cases = [];
+  this.expect(_tokentype.types.braceL);
+  this.labels.push(switchLabel);
+
+  // Statements under must be grouped (by label) in SwitchCase
+  // nodes. `cur` is used to keep the node that we are currently
+  // adding statements to.
+
+  for (var cur, sawDefault = false; this.type != _tokentype.types.braceR;) {
+    if (this.type === _tokentype.types._case || this.type === _tokentype.types._default) {
+      var isCase = this.type === _tokentype.types._case;
+      if (cur) this.finishNode(cur, "SwitchCase");
+      node.cases.push(cur = this.startNode());
+      cur.consequent = [];
+      this.next();
+      if (isCase) {
+        cur.test = this.parseExpression();
+      } else {
+        if (sawDefault) this.raise(this.lastTokStart, "Multiple default clauses");
+        sawDefault = true;
+        cur.test = null;
+      }
+      this.expect(_tokentype.types.colon);
+    } else {
+      if (!cur) this.unexpected();
+      cur.consequent.push(this.parseStatement(true));
+    }
+  }
+  if (cur) this.finishNode(cur, "SwitchCase");
+  this.next(); // Closing brace
+  this.labels.pop();
+  return this.finishNode(node, "SwitchStatement");
+};
+
+pp.parseThrowStatement = function (node) {
+  this.next();
+  if (_whitespace.lineBreak.test(this.input.slice(this.lastTokEnd, this.start))) this.raise(this.lastTokEnd, "Illegal newline after throw");
+  node.argument = this.parseExpression();
+  this.semicolon();
+  return this.finishNode(node, "ThrowStatement");
+};
+
+// Reused empty array added for node fields that are always empty.
+
+var empty = [];
+
+pp.parseTryStatement = function (node) {
+  this.next();
+  node.block = this.parseBlock();
+  node.handler = null;
+  if (this.type === _tokentype.types._catch) {
+    var clause = this.startNode();
+    this.next();
+    this.expect(_tokentype.types.parenL);
+    clause.param = this.parseBindingAtom();
+    this.checkLVal(clause.param, true);
+    this.expect(_tokentype.types.parenR);
+    clause.body = this.parseBlock();
+    node.handler = this.finishNode(clause, "CatchClause");
+  }
+  node.finalizer = this.eat(_tokentype.types._finally) ? this.parseBlock() : null;
+  if (!node.handler && !node.finalizer) this.raise(node.start, "Missing catch or finally clause");
+  return this.finishNode(node, "TryStatement");
+};
+
+pp.parseVarStatement = function (node, kind) {
+  this.next();
+  this.parseVar(node, false, kind);
+  this.semicolon();
+  return this.finishNode(node, "VariableDeclaration");
+};
+
+pp.parseWhileStatement = function (node) {
+  this.next();
+  node.test = this.parseParenExpression();
+  this.labels.push(loopLabel);
+  node.body = this.parseStatement(false);
+  this.labels.pop();
+  return this.finishNode(node, "WhileStatement");
+};
+
+pp.parseWithStatement = function (node) {
+  if (this.strict) this.raise(this.start, "'with' in strict mode");
+  this.next();
+  node.object = this.parseParenExpression();
+  node.body = this.parseStatement(false);
+  return this.finishNode(node, "WithStatement");
+};
+
+pp.parseEmptyStatement = function (node) {
+  this.next();
+  return this.finishNode(node, "EmptyStatement");
+};
+
+pp.parseLabeledStatement = function (node, maybeName, expr) {
+  for (var i = 0; i < this.labels.length; ++i) {
+    if (this.labels[i].name === maybeName) this.raise(expr.start, "Label '" + maybeName + "' is already declared");
+  }var kind = this.type.isLoop ? "loop" : this.type === _tokentype.types._switch ? "switch" : null;
+  for (var i = this.labels.length - 1; i >= 0; i--) {
+    var label = this.labels[i];
+    if (label.statementStart == node.start) {
+      label.statementStart = this.start;
+      label.kind = kind;
+    } else break;
+  }
+  this.labels.push({ name: maybeName, kind: kind, statementStart: this.start });
+  node.body = this.parseStatement(true);
+  this.labels.pop();
+  node.label = expr;
+  return this.finishNode(node, "LabeledStatement");
+};
+
+pp.parseExpressionStatement = function (node, expr) {
+  node.expression = expr;
+  this.semicolon();
+  return this.finishNode(node, "ExpressionStatement");
+};
+
+// Parse a semicolon-enclosed block of statements, handling `"use
+// strict"` declarations when `allowStrict` is true (used for
+// function bodies).
+
+pp.parseBlock = function (allowStrict) {
+  var node = this.startNode(),
+      first = true,
+      oldStrict = undefined;
+  node.body = [];
+  this.expect(_tokentype.types.braceL);
+  while (!this.eat(_tokentype.types.braceR)) {
+    var stmt = this.parseStatement(true);
+    node.body.push(stmt);
+    if (first && allowStrict && this.isUseStrict(stmt)) {
+      oldStrict = this.strict;
+      this.setStrict(this.strict = true);
+    }
+    first = false;
+  }
+  if (oldStrict === false) this.setStrict(false);
+  return this.finishNode(node, "BlockStatement");
+};
+
+// Parse a regular `for` loop. The disambiguation code in
+// `parseStatement` will already have parsed the init statement or
+// expression.
+
+pp.parseFor = function (node, init) {
+  node.init = init;
+  this.expect(_tokentype.types.semi);
+  node.test = this.type === _tokentype.types.semi ? null : this.parseExpression();
+  this.expect(_tokentype.types.semi);
+  node.update = this.type === _tokentype.types.parenR ? null : this.parseExpression();
+  this.expect(_tokentype.types.parenR);
+  node.body = this.parseStatement(false);
+  this.labels.pop();
+  return this.finishNode(node, "ForStatement");
+};
+
+// Parse a `for`/`in` and `for`/`of` loop, which are almost
+// same from parser's perspective.
+
+pp.parseForIn = function (node, init) {
+  var type = this.type === _tokentype.types._in ? "ForInStatement" : "ForOfStatement";
+  this.next();
+  node.left = init;
+  node.right = this.parseExpression();
+  this.expect(_tokentype.types.parenR);
+  node.body = this.parseStatement(false);
+  this.labels.pop();
+  return this.finishNode(node, type);
+};
+
+// Parse a list of variable declarations.
+
+pp.parseVar = function (node, isFor, kind) {
+  node.declarations = [];
+  node.kind = kind.keyword;
+  for (;;) {
+    var decl = this.startNode();
+    this.parseVarId(decl);
+    if (this.eat(_tokentype.types.eq)) {
+      decl.init = this.parseMaybeAssign(isFor);
+    } else if (kind === _tokentype.types._const && !(this.type === _tokentype.types._in || this.options.ecmaVersion >= 6 && this.isContextual("of"))) {
+      this.unexpected();
+    } else if (decl.id.type != "Identifier" && !(isFor && (this.type === _tokentype.types._in || this.isContextual("of")))) {
+      this.raise(this.lastTokEnd, "Complex binding patterns require an initialization value");
+    } else {
+      decl.init = null;
+    }
+    node.declarations.push(this.finishNode(decl, "VariableDeclarator"));
+    if (!this.eat(_tokentype.types.comma)) break;
+  }
+  return node;
+};
+
+pp.parseVarId = function (decl) {
+  decl.id = this.parseBindingAtom();
+  this.checkLVal(decl.id, true);
+};
+
+// Parse a function declaration or literal (depending on the
+// `isStatement` parameter).
+
+pp.parseFunction = function (node, isStatement, allowExpressionBody) {
+  this.initFunction(node);
+  if (this.options.ecmaVersion >= 6) node.generator = this.eat(_tokentype.types.star);
+  if (isStatement || this.type === _tokentype.types.name) node.id = this.parseIdent();
+  this.parseFunctionParams(node);
+  this.parseFunctionBody(node, allowExpressionBody);
+  return this.finishNode(node, isStatement ? "FunctionDeclaration" : "FunctionExpression");
+};
+
+pp.parseFunctionParams = function (node) {
+  this.expect(_tokentype.types.parenL);
+  node.params = this.parseBindingList(_tokentype.types.parenR, false, false, true);
+};
+
+// Parse a class declaration or literal (depending on the
+// `isStatement` parameter).
+
+pp.parseClass = function (node, isStatement) {
+  this.next();
+  this.parseClassId(node, isStatement);
+  this.parseClassSuper(node);
+  var classBody = this.startNode();
+  var hadConstructor = false;
+  classBody.body = [];
+  this.expect(_tokentype.types.braceL);
+  while (!this.eat(_tokentype.types.braceR)) {
+    if (this.eat(_tokentype.types.semi)) continue;
+    var method = this.startNode();
+    var isGenerator = this.eat(_tokentype.types.star);
+    var isMaybeStatic = this.type === _tokentype.types.name && this.value === "static";
+    this.parsePropertyName(method);
+    method["static"] = isMaybeStatic && this.type !== _tokentype.types.parenL;
+    if (method["static"]) {
+      if (isGenerator) this.unexpected();
+      isGenerator = this.eat(_tokentype.types.star);
+      this.parsePropertyName(method);
+    }
+    method.kind = "method";
+    var isGetSet = false;
+    if (!method.computed) {
+      var key = method.key;
+
+      if (!isGenerator && key.type === "Identifier" && this.type !== _tokentype.types.parenL && (key.name === "get" || key.name === "set")) {
+        isGetSet = true;
+        method.kind = key.name;
+        key = this.parsePropertyName(method);
+      }
+      if (!method["static"] && (key.type === "Identifier" && key.name === "constructor" || key.type === "Literal" && key.value === "constructor")) {
+        if (hadConstructor) this.raise(key.start, "Duplicate constructor in the same class");
+        if (isGetSet) this.raise(key.start, "Constructor can't have get/set modifier");
+        if (isGenerator) this.raise(key.start, "Constructor can't be a generator");
+        method.kind = "constructor";
+        hadConstructor = true;
+      }
+    }
+    this.parseClassMethod(classBody, method, isGenerator);
+    if (isGetSet) {
+      var paramCount = method.kind === "get" ? 0 : 1;
+      if (method.value.params.length !== paramCount) {
+        var start = method.value.start;
+        if (method.kind === "get") this.raise(start, "getter should have no params");else this.raise(start, "setter should have exactly one param");
+      }
+    }
+  }
+  node.body = this.finishNode(classBody, "ClassBody");
+  return this.finishNode(node, isStatement ? "ClassDeclaration" : "ClassExpression");
+};
+
+pp.parseClassMethod = function (classBody, method, isGenerator) {
+  method.value = this.parseMethod(isGenerator);
+  classBody.body.push(this.finishNode(method, "MethodDefinition"));
+};
+
+pp.parseClassId = function (node, isStatement) {
+  node.id = this.type === _tokentype.types.name ? this.parseIdent() : isStatement ? this.unexpected() : null;
+};
+
+pp.parseClassSuper = function (node) {
+  node.superClass = this.eat(_tokentype.types._extends) ? this.parseExprSubscripts() : null;
+};
+
+// Parses module export declaration.
+
+pp.parseExport = function (node) {
+  this.next();
+  // export * from '...'
+  if (this.eat(_tokentype.types.star)) {
+    this.expectContextual("from");
+    node.source = this.type === _tokentype.types.string ? this.parseExprAtom() : this.unexpected();
+    this.semicolon();
+    return this.finishNode(node, "ExportAllDeclaration");
+  }
+  if (this.eat(_tokentype.types._default)) {
+    // export default ...
+    var expr = this.parseMaybeAssign();
+    var needsSemi = true;
+    if (expr.type == "FunctionExpression" || expr.type == "ClassExpression") {
+      needsSemi = false;
+      if (expr.id) {
+        expr.type = expr.type == "FunctionExpression" ? "FunctionDeclaration" : "ClassDeclaration";
+      }
+    }
+    node.declaration = expr;
+    if (needsSemi) this.semicolon();
+    return this.finishNode(node, "ExportDefaultDeclaration");
+  }
+  // export var|const|let|function|class ...
+  if (this.shouldParseExportStatement()) {
+    node.declaration = this.parseStatement(true);
+    node.specifiers = [];
+    node.source = null;
+  } else {
+    // export { x, y as z } [from '...']
+    node.declaration = null;
+    node.specifiers = this.parseExportSpecifiers();
+    if (this.eatContextual("from")) {
+      node.source = this.type === _tokentype.types.string ? this.parseExprAtom() : this.unexpected();
+    } else {
+      // check for keywords used as local names
+      for (var i = 0; i < node.specifiers.length; i++) {
+        if (this.keywords.test(node.specifiers[i].local.name) || this.reservedWords.test(node.specifiers[i].local.name)) {
+          this.unexpected(node.specifiers[i].local.start);
+        }
+      }
+
+      node.source = null;
+    }
+    this.semicolon();
+  }
+  return this.finishNode(node, "ExportNamedDeclaration");
+};
+
+pp.shouldParseExportStatement = function () {
+  return this.type.keyword;
+};
+
+// Parses a comma-separated list of module exports.
+
+pp.parseExportSpecifiers = function () {
+  var nodes = [],
+      first = true;
+  // export { x, y as z } [from '...']
+  this.expect(_tokentype.types.braceL);
+  while (!this.eat(_tokentype.types.braceR)) {
+    if (!first) {
+      this.expect(_tokentype.types.comma);
+      if (this.afterTrailingComma(_tokentype.types.braceR)) break;
+    } else first = false;
+
+    var node = this.startNode();
+    node.local = this.parseIdent(this.type === _tokentype.types._default);
+    node.exported = this.eatContextual("as") ? this.parseIdent(true) : node.local;
+    nodes.push(this.finishNode(node, "ExportSpecifier"));
+  }
+  return nodes;
+};
+
+// Parses import declaration.
+
+pp.parseImport = function (node) {
+  this.next();
+  // import '...'
+  if (this.type === _tokentype.types.string) {
+    node.specifiers = empty;
+    node.source = this.parseExprAtom();
+  } else {
+    node.specifiers = this.parseImportSpecifiers();
+    this.expectContextual("from");
+    node.source = this.type === _tokentype.types.string ? this.parseExprAtom() : this.unexpected();
+  }
+  this.semicolon();
+  return this.finishNode(node, "ImportDeclaration");
+};
+
+// Parses a comma-separated list of module imports.
+
+pp.parseImportSpecifiers = function () {
+  var nodes = [],
+      first = true;
+  if (this.type === _tokentype.types.name) {
+    // import defaultObj, { x, y as z } from '...'
+    var node = this.startNode();
+    node.local = this.parseIdent();
+    this.checkLVal(node.local, true);
+    nodes.push(this.finishNode(node, "ImportDefaultSpecifier"));
+    if (!this.eat(_tokentype.types.comma)) return nodes;
+  }
+  if (this.type === _tokentype.types.star) {
+    var node = this.startNode();
+    this.next();
+    this.expectContextual("as");
+    node.local = this.parseIdent();
+    this.checkLVal(node.local, true);
+    nodes.push(this.finishNode(node, "ImportNamespaceSpecifier"));
+    return nodes;
+  }
+  this.expect(_tokentype.types.braceL);
+  while (!this.eat(_tokentype.types.braceR)) {
+    if (!first) {
+      this.expect(_tokentype.types.comma);
+      if (this.afterTrailingComma(_tokentype.types.braceR)) break;
+    } else first = false;
+
+    var node = this.startNode();
+    node.imported = this.parseIdent(true);
+    node.local = this.eatContextual("as") ? this.parseIdent() : node.imported;
+    this.checkLVal(node.local, true);
+    nodes.push(this.finishNode(node, "ImportSpecifier"));
+  }
+  return nodes;
+};
+
+},{"./state":10,"./tokentype":14,"./whitespace":16}],12:[function(_dereq_,module,exports){
+// The algorithm used to determine whether a regexp can appear at a
+// given point in the program is loosely based on sweet.js' approach.
+// See https://github.com/mozilla/sweet.js/wiki/design
+
+"use strict";
+
+exports.__esModule = true;
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+var _state = _dereq_("./state");
+
+var _tokentype = _dereq_("./tokentype");
+
+var _whitespace = _dereq_("./whitespace");
+
+var TokContext = function TokContext(token, isExpr, preserveSpace, override) {
+  _classCallCheck(this, TokContext);
+
+  this.token = token;
+  this.isExpr = !!isExpr;
+  this.preserveSpace = !!preserveSpace;
+  this.override = override;
+};
+
+exports.TokContext = TokContext;
+var types = {
+  b_stat: new TokContext("{", false),
+  b_expr: new TokContext("{", true),
+  b_tmpl: new TokContext("${", true),
+  p_stat: new TokContext("(", false),
+  p_expr: new TokContext("(", true),
+  q_tmpl: new TokContext("`", true, true, function (p) {
+    return p.readTmplToken();
+  }),
+  f_expr: new TokContext("function", true)
+};
+
+exports.types = types;
+var pp = _state.Parser.prototype;
+
+pp.initialContext = function () {
+  return [types.b_stat];
+};
+
+pp.braceIsBlock = function (prevType) {
+  if (prevType === _tokentype.types.colon) {
+    var _parent = this.curContext();
+    if (_parent === types.b_stat || _parent === types.b_expr) return !_parent.isExpr;
+  }
+  if (prevType === _tokentype.types._return) return _whitespace.lineBreak.test(this.input.slice(this.lastTokEnd, this.start));
+  if (prevType === _tokentype.types._else || prevType === _tokentype.types.semi || prevType === _tokentype.types.eof || prevType === _tokentype.types.parenR) return true;
+  if (prevType == _tokentype.types.braceL) return this.curContext() === types.b_stat;
+  return !this.exprAllowed;
+};
+
+pp.updateContext = function (prevType) {
+  var update = undefined,
+      type = this.type;
+  if (type.keyword && prevType == _tokentype.types.dot) this.exprAllowed = false;else if (update = type.updateContext) update.call(this, prevType);else this.exprAllowed = type.beforeExpr;
+};
+
+// Token-specific context update code
+
+_tokentype.types.parenR.updateContext = _tokentype.types.braceR.updateContext = function () {
+  if (this.context.length == 1) {
+    this.exprAllowed = true;
+    return;
+  }
+  var out = this.context.pop();
+  if (out === types.b_stat && this.curContext() === types.f_expr) {
+    this.context.pop();
+    this.exprAllowed = false;
+  } else if (out === types.b_tmpl) {
+    this.exprAllowed = true;
+  } else {
+    this.exprAllowed = !out.isExpr;
+  }
+};
+
+_tokentype.types.braceL.updateContext = function (prevType) {
+  this.context.push(this.braceIsBlock(prevType) ? types.b_stat : types.b_expr);
+  this.exprAllowed = true;
+};
+
+_tokentype.types.dollarBraceL.updateContext = function () {
+  this.context.push(types.b_tmpl);
+  this.exprAllowed = true;
+};
+
+_tokentype.types.parenL.updateContext = function (prevType) {
+  var statementParens = prevType === _tokentype.types._if || prevType === _tokentype.types._for || prevType === _tokentype.types._with || prevType === _tokentype.types._while;
+  this.context.push(statementParens ? types.p_stat : types.p_expr);
+  this.exprAllowed = true;
+};
+
+_tokentype.types.incDec.updateContext = function () {
+  // tokExprAllowed stays unchanged
+};
+
+_tokentype.types._function.updateContext = function () {
+  if (this.curContext() !== types.b_stat) this.context.push(types.f_expr);
+  this.exprAllowed = false;
+};
+
+_tokentype.types.backQuote.updateContext = function () {
+  if (this.curContext() === types.q_tmpl) this.context.pop();else this.context.push(types.q_tmpl);
+  this.exprAllowed = false;
+};
+
+},{"./state":10,"./tokentype":14,"./whitespace":16}],13:[function(_dereq_,module,exports){
+"use strict";
+
+exports.__esModule = true;
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+var _identifier = _dereq_("./identifier");
+
+var _tokentype = _dereq_("./tokentype");
+
+var _state = _dereq_("./state");
+
+var _locutil = _dereq_("./locutil");
+
+var _whitespace = _dereq_("./whitespace");
+
+// Object type used to represent tokens. Note that normally, tokens
+// simply exist as properties on the parser object. This is only
+// used for the onToken callback and the external tokenizer.
+
+var Token = function Token(p) {
+  _classCallCheck(this, Token);
+
+  this.type = p.type;
+  this.value = p.value;
+  this.start = p.start;
+  this.end = p.end;
+  if (p.options.locations) this.loc = new _locutil.SourceLocation(p, p.startLoc, p.endLoc);
+  if (p.options.ranges) this.range = [p.start, p.end];
+}
+
+// ## Tokenizer
+
+;
+
+exports.Token = Token;
+var pp = _state.Parser.prototype;
+
+// Are we running under Rhino?
+var isRhino = typeof Packages == "object" && Object.prototype.toString.call(Packages) == "[object JavaPackage]";
+
+// Move to the next token
+
+pp.next = function () {
+  if (this.options.onToken) this.options.onToken(new Token(this));
+
+  this.lastTokEnd = this.end;
+  this.lastTokStart = this.start;
+  this.lastTokEndLoc = this.endLoc;
+  this.lastTokStartLoc = this.startLoc;
+  this.nextToken();
+};
+
+pp.getToken = function () {
+  this.next();
+  return new Token(this);
+};
+
+// If we're in an ES6 environment, make parsers iterable
+if (typeof Symbol !== "undefined") pp[Symbol.iterator] = function () {
+  var self = this;
+  return { next: function next() {
+      var token = self.getToken();
+      return {
+        done: token.type === _tokentype.types.eof,
+        value: token
+      };
+    } };
+};
+
+// Toggle strict mode. Re-reads the next number or string to please
+// pedantic tests (`"use strict"; 010;` should fail).
+
+pp.setStrict = function (strict) {
+  this.strict = strict;
+  if (this.type !== _tokentype.types.num && this.type !== _tokentype.types.string) return;
+  this.pos = this.start;
+  if (this.options.locations) {
+    while (this.pos < this.lineStart) {
+      this.lineStart = this.input.lastIndexOf("\n", this.lineStart - 2) + 1;
+      --this.curLine;
+    }
+  }
+  this.nextToken();
+};
+
+pp.curContext = function () {
+  return this.context[this.context.length - 1];
+};
+
+// Read a single token, updating the parser object's token-related
+// properties.
+
+pp.nextToken = function () {
+  var curContext = this.curContext();
+  if (!curContext || !curContext.preserveSpace) this.skipSpace();
+
+  this.start = this.pos;
+  if (this.options.locations) this.startLoc = this.curPosition();
+  if (this.pos >= this.input.length) return this.finishToken(_tokentype.types.eof);
+
+  if (curContext.override) return curContext.override(this);else this.readToken(this.fullCharCodeAtPos());
+};
+
+pp.readToken = function (code) {
+  // Identifier or keyword. '\uXXXX' sequences are allowed in
+  // identifiers, so '\' also dispatches to that.
+  if (_identifier.isIdentifierStart(code, this.options.ecmaVersion >= 6) || code === 92 /* '\' */) return this.readWord();
+
+  return this.getTokenFromCode(code);
+};
+
+pp.fullCharCodeAtPos = function () {
+  var code = this.input.charCodeAt(this.pos);
+  if (code <= 0xd7ff || code >= 0xe000) return code;
+  var next = this.input.charCodeAt(this.pos + 1);
+  return (code << 10) + next - 0x35fdc00;
+};
+
+pp.skipBlockComment = function () {
+  var startLoc = this.options.onComment && this.curPosition();
+  var start = this.pos,
+      end = this.input.indexOf("*/", this.pos += 2);
+  if (end === -1) this.raise(this.pos - 2, "Unterminated comment");
+  this.pos = end + 2;
+  if (this.options.locations) {
+    _whitespace.lineBreakG.lastIndex = start;
+    var match = undefined;
+    while ((match = _whitespace.lineBreakG.exec(this.input)) && match.index < this.pos) {
+      ++this.curLine;
+      this.lineStart = match.index + match[0].length;
+    }
+  }
+  if (this.options.onComment) this.options.onComment(true, this.input.slice(start + 2, end), start, this.pos, startLoc, this.curPosition());
+};
+
+pp.skipLineComment = function (startSkip) {
+  var start = this.pos;
+  var startLoc = this.options.onComment && this.curPosition();
+  var ch = this.input.charCodeAt(this.pos += startSkip);
+  while (this.pos < this.input.length && ch !== 10 && ch !== 13 && ch !== 8232 && ch !== 8233) {
+    ++this.pos;
+    ch = this.input.charCodeAt(this.pos);
+  }
+  if (this.options.onComment) this.options.onComment(false, this.input.slice(start + startSkip, this.pos), start, this.pos, startLoc, this.curPosition());
+};
+
+// Called at the start of the parse and after every token. Skips
+// whitespace and comments, and.
+
+pp.skipSpace = function () {
+  loop: while (this.pos < this.input.length) {
+    var ch = this.input.charCodeAt(this.pos);
+    switch (ch) {
+      case 32:case 160:
+        // ' '
+        ++this.pos;
+        break;
+      case 13:
+        if (this.input.charCodeAt(this.pos + 1) === 10) {
+          ++this.pos;
+        }
+      case 10:case 8232:case 8233:
+        ++this.pos;
+        if (this.options.locations) {
+          ++this.curLine;
+          this.lineStart = this.pos;
+        }
+        break;
+      case 47:
+        // '/'
+        switch (this.input.charCodeAt(this.pos + 1)) {
+          case 42:
+            // '*'
+            this.skipBlockComment();
+            break;
+          case 47:
+            this.skipLineComment(2);
+            break;
+          default:
+            break loop;
+        }
+        break;
+      default:
+        if (ch > 8 && ch < 14 || ch >= 5760 && _whitespace.nonASCIIwhitespace.test(String.fromCharCode(ch))) {
+          ++this.pos;
+        } else {
+          break loop;
+        }
+    }
+  }
+};
+
+// Called at the end of every token. Sets `end`, `val`, and
+// maintains `context` and `exprAllowed`, and skips the space after
+// the token, so that the next one's `start` will point at the
+// right position.
+
+pp.finishToken = function (type, val) {
+  this.end = this.pos;
+  if (this.options.locations) this.endLoc = this.curPosition();
+  var prevType = this.type;
+  this.type = type;
+  this.value = val;
+
+  this.updateContext(prevType);
+};
+
+// ### Token reading
+
+// This is the function that is called to fetch the next token. It
+// is somewhat obscure, because it works in character codes rather
+// than characters, and because operator parsing has been inlined
+// into it.
+//
+// All in the name of speed.
+//
+pp.readToken_dot = function () {
+  var next = this.input.charCodeAt(this.pos + 1);
+  if (next >= 48 && next <= 57) return this.readNumber(true);
+  var next2 = this.input.charCodeAt(this.pos + 2);
+  if (this.options.ecmaVersion >= 6 && next === 46 && next2 === 46) {
+    // 46 = dot '.'
+    this.pos += 3;
+    return this.finishToken(_tokentype.types.ellipsis);
+  } else {
+    ++this.pos;
+    return this.finishToken(_tokentype.types.dot);
+  }
+};
+
+pp.readToken_slash = function () {
+  // '/'
+  var next = this.input.charCodeAt(this.pos + 1);
+  if (this.exprAllowed) {
+    ++this.pos;return this.readRegexp();
+  }
+  if (next === 61) return this.finishOp(_tokentype.types.assign, 2);
+  return this.finishOp(_tokentype.types.slash, 1);
+};
+
+pp.readToken_mult_modulo = function (code) {
+  // '%*'
+  var next = this.input.charCodeAt(this.pos + 1);
+  if (next === 61) return this.finishOp(_tokentype.types.assign, 2);
+  return this.finishOp(code === 42 ? _tokentype.types.star : _tokentype.types.modulo, 1);
+};
+
+pp.readToken_pipe_amp = function (code) {
+  // '|&'
+  var next = this.input.charCodeAt(this.pos + 1);
+  if (next === code) return this.finishOp(code === 124 ? _tokentype.types.logicalOR : _tokentype.types.logicalAND, 2);
+  if (next === 61) return this.finishOp(_tokentype.types.assign, 2);
+  return this.finishOp(code === 124 ? _tokentype.types.bitwiseOR : _tokentype.types.bitwiseAND, 1);
+};
+
+pp.readToken_caret = function () {
+  // '^'
+  var next = this.input.charCodeAt(this.pos + 1);
+  if (next === 61) return this.finishOp(_tokentype.types.assign, 2);
+  return this.finishOp(_tokentype.types.bitwiseXOR, 1);
+};
+
+pp.readToken_plus_min = function (code) {
+  // '+-'
+  var next = this.input.charCodeAt(this.pos + 1);
+  if (next === code) {
+    if (next == 45 && this.input.charCodeAt(this.pos + 2) == 62 && _whitespace.lineBreak.test(this.input.slice(this.lastTokEnd, this.pos))) {
+      // A `-->` line comment
+      this.skipLineComment(3);
+      this.skipSpace();
+      return this.nextToken();
+    }
+    return this.finishOp(_tokentype.types.incDec, 2);
+  }
+  if (next === 61) return this.finishOp(_tokentype.types.assign, 2);
+  return this.finishOp(_tokentype.types.plusMin, 1);
+};
+
+pp.readToken_lt_gt = function (code) {
+  // '<>'
+  var next = this.input.charCodeAt(this.pos + 1);
+  var size = 1;
+  if (next === code) {
+    size = code === 62 && this.input.charCodeAt(this.pos + 2) === 62 ? 3 : 2;
+    if (this.input.charCodeAt(this.pos + size) === 61) return this.finishOp(_tokentype.types.assign, size + 1);
+    return this.finishOp(_tokentype.types.bitShift, size);
+  }
+  if (next == 33 && code == 60 && this.input.charCodeAt(this.pos + 2) == 45 && this.input.charCodeAt(this.pos + 3) == 45) {
+    if (this.inModule) this.unexpected();
+    // `<!--`, an XML-style comment that should be interpreted as a line comment
+    this.skipLineComment(4);
+    this.skipSpace();
+    return this.nextToken();
+  }
+  if (next === 61) size = this.input.charCodeAt(this.pos + 2) === 61 ? 3 : 2;
+  return this.finishOp(_tokentype.types.relational, size);
+};
+
+pp.readToken_eq_excl = function (code) {
+  // '=!'
+  var next = this.input.charCodeAt(this.pos + 1);
+  if (next === 61) return this.finishOp(_tokentype.types.equality, this.input.charCodeAt(this.pos + 2) === 61 ? 3 : 2);
+  if (code === 61 && next === 62 && this.options.ecmaVersion >= 6) {
+    // '=>'
+    this.pos += 2;
+    return this.finishToken(_tokentype.types.arrow);
+  }
+  return this.finishOp(code === 61 ? _tokentype.types.eq : _tokentype.types.prefix, 1);
+};
+
+pp.getTokenFromCode = function (code) {
+  switch (code) {
+    // The interpretation of a dot depends on whether it is followed
+    // by a digit or another two dots.
+    case 46:
+      // '.'
+      return this.readToken_dot();
+
+    // Punctuation tokens.
+    case 40:
+      ++this.pos;return this.finishToken(_tokentype.types.parenL);
+    case 41:
+      ++this.pos;return this.finishToken(_tokentype.types.parenR);
+    case 59:
+      ++this.pos;return this.finishToken(_tokentype.types.semi);
+    case 44:
+      ++this.pos;return this.finishToken(_tokentype.types.comma);
+    case 91:
+      ++this.pos;return this.finishToken(_tokentype.types.bracketL);
+    case 93:
+      ++this.pos;return this.finishToken(_tokentype.types.bracketR);
+    case 123:
+      ++this.pos;return this.finishToken(_tokentype.types.braceL);
+    case 125:
+      ++this.pos;return this.finishToken(_tokentype.types.braceR);
+    case 58:
+      ++this.pos;return this.finishToken(_tokentype.types.colon);
+    case 63:
+      ++this.pos;return this.finishToken(_tokentype.types.question);
+
+    case 96:
+      // '`'
+      if (this.options.ecmaVersion < 6) break;
+      ++this.pos;
+      return this.finishToken(_tokentype.types.backQuote);
+
+    case 48:
+      // '0'
+      var next = this.input.charCodeAt(this.pos + 1);
+      if (next === 120 || next === 88) return this.readRadixNumber(16); // '0x', '0X' - hex number
+      if (this.options.ecmaVersion >= 6) {
+        if (next === 111 || next === 79) return this.readRadixNumber(8); // '0o', '0O' - octal number
+        if (next === 98 || next === 66) return this.readRadixNumber(2); // '0b', '0B' - binary number
+      }
+    // Anything else beginning with a digit is an integer, octal
+    // number, or float.
+    case 49:case 50:case 51:case 52:case 53:case 54:case 55:case 56:case 57:
+      // 1-9
+      return this.readNumber(false);
+
+    // Quotes produce strings.
+    case 34:case 39:
+      // '"', "'"
+      return this.readString(code);
+
+    // Operators are parsed inline in tiny state machines. '=' (61) is
+    // often referred to. `finishOp` simply skips the amount of
+    // characters it is given as second argument, and returns a token
+    // of the type given by its first argument.
+
+    case 47:
+      // '/'
+      return this.readToken_slash();
+
+    case 37:case 42:
+      // '%*'
+      return this.readToken_mult_modulo(code);
+
+    case 124:case 38:
+      // '|&'
+      return this.readToken_pipe_amp(code);
+
+    case 94:
+      // '^'
+      return this.readToken_caret();
+
+    case 43:case 45:
+      // '+-'
+      return this.readToken_plus_min(code);
+
+    case 60:case 62:
+      // '<>'
+      return this.readToken_lt_gt(code);
+
+    case 61:case 33:
+      // '=!'
+      return this.readToken_eq_excl(code);
+
+    case 126:
+      // '~'
+      return this.finishOp(_tokentype.types.prefix, 1);
+  }
+
+  this.raise(this.pos, "Unexpected character '" + codePointToString(code) + "'");
+};
+
+pp.finishOp = function (type, size) {
+  var str = this.input.slice(this.pos, this.pos + size);
+  this.pos += size;
+  return this.finishToken(type, str);
+};
+
+// Parse a regular expression. Some context-awareness is necessary,
+// since a '/' inside a '[]' set does not end the expression.
+
+function tryCreateRegexp(src, flags, throwErrorAt, parser) {
+  try {
+    return new RegExp(src, flags);
+  } catch (e) {
+    if (throwErrorAt !== undefined) {
+      if (e instanceof SyntaxError) parser.raise(throwErrorAt, "Error parsing regular expression: " + e.message);
+      throw e;
+    }
+  }
+}
+
+var regexpUnicodeSupport = !!tryCreateRegexp("￿", "u");
+
+pp.readRegexp = function () {
+  var _this = this;
+
+  var escaped = undefined,
+      inClass = undefined,
+      start = this.pos;
+  for (;;) {
+    if (this.pos >= this.input.length) this.raise(start, "Unterminated regular expression");
+    var ch = this.input.charAt(this.pos);
+    if (_whitespace.lineBreak.test(ch)) this.raise(start, "Unterminated regular expression");
+    if (!escaped) {
+      if (ch === "[") inClass = true;else if (ch === "]" && inClass) inClass = false;else if (ch === "/" && !inClass) break;
+      escaped = ch === "\\";
+    } else escaped = false;
+    ++this.pos;
+  }
+  var content = this.input.slice(start, this.pos);
+  ++this.pos;
+  // Need to use `readWord1` because '\uXXXX' sequences are allowed
+  // here (don't ask).
+  var mods = this.readWord1();
+  var tmp = content;
+  if (mods) {
+    var validFlags = /^[gmsiy]*$/;
+    if (this.options.ecmaVersion >= 6) validFlags = /^[gmsiyu]*$/;
+    if (!validFlags.test(mods)) this.raise(start, "Invalid regular expression flag");
+    if (mods.indexOf('u') >= 0 && !regexpUnicodeSupport) {
+      // Replace each astral symbol and every Unicode escape sequence that
+      // possibly represents an astral symbol or a paired surrogate with a
+      // single ASCII symbol to avoid throwing on regular expressions that
+      // are only valid in combination with the `/u` flag.
+      // Note: replacing with the ASCII symbol `x` might cause false
+      // negatives in unlikely scenarios. For example, `[\u{61}-b]` is a
+      // perfectly valid pattern that is equivalent to `[a-b]`, but it would
+      // be replaced by `[x-b]` which throws an error.
+      tmp = tmp.replace(/\\u\{([0-9a-fA-F]+)\}/g, function (_match, code, offset) {
+        code = Number("0x" + code);
+        if (code > 0x10FFFF) _this.raise(start + offset + 3, "Code point out of bounds");
+        return "x";
+      });
+      tmp = tmp.replace(/\\u([a-fA-F0-9]{4})|[\uD800-\uDBFF][\uDC00-\uDFFF]/g, "x");
+    }
+  }
+  // Detect invalid regular expressions.
+  var value = null;
+  // Rhino's regular expression parser is flaky and throws uncatchable exceptions,
+  // so don't do detection if we are running under Rhino
+  if (!isRhino) {
+    tryCreateRegexp(tmp, undefined, start, this);
+    // Get a regular expression object for this pattern-flag pair, or `null` in
+    // case the current environment doesn't support the flags it uses.
+    value = tryCreateRegexp(content, mods);
+  }
+  return this.finishToken(_tokentype.types.regexp, { pattern: content, flags: mods, value: value });
+};
+
+// Read an integer in the given radix. Return null if zero digits
+// were read, the integer value otherwise. When `len` is given, this
+// will return `null` unless the integer has exactly `len` digits.
+
+pp.readInt = function (radix, len) {
+  var start = this.pos,
+      total = 0;
+  for (var i = 0, e = len == null ? Infinity : len; i < e; ++i) {
+    var code = this.input.charCodeAt(this.pos),
+        val = undefined;
+    if (code >= 97) val = code - 97 + 10; // a
+    else if (code >= 65) val = code - 65 + 10; // A
+      else if (code >= 48 && code <= 57) val = code - 48; // 0-9
+        else val = Infinity;
+    if (val >= radix) break;
+    ++this.pos;
+    total = total * radix + val;
+  }
+  if (this.pos === start || len != null && this.pos - start !== len) return null;
+
+  return total;
+};
+
+pp.readRadixNumber = function (radix) {
+  this.pos += 2; // 0x
+  var val = this.readInt(radix);
+  if (val == null) this.raise(this.start + 2, "Expected number in radix " + radix);
+  if (_identifier.isIdentifierStart(this.fullCharCodeAtPos())) this.raise(this.pos, "Identifier directly after number");
+  return this.finishToken(_tokentype.types.num, val);
+};
+
+// Read an integer, octal integer, or floating-point number.
+
+pp.readNumber = function (startsWithDot) {
+  var start = this.pos,
+      isFloat = false,
+      octal = this.input.charCodeAt(this.pos) === 48;
+  if (!startsWithDot && this.readInt(10) === null) this.raise(start, "Invalid number");
+  var next = this.input.charCodeAt(this.pos);
+  if (next === 46) {
+    // '.'
+    ++this.pos;
+    this.readInt(10);
+    isFloat = true;
+    next = this.input.charCodeAt(this.pos);
+  }
+  if (next === 69 || next === 101) {
+    // 'eE'
+    next = this.input.charCodeAt(++this.pos);
+    if (next === 43 || next === 45) ++this.pos; // '+-'
+    if (this.readInt(10) === null) this.raise(start, "Invalid number");
+    isFloat = true;
+  }
+  if (_identifier.isIdentifierStart(this.fullCharCodeAtPos())) this.raise(this.pos, "Identifier directly after number");
+
+  var str = this.input.slice(start, this.pos),
+      val = undefined;
+  if (isFloat) val = parseFloat(str);else if (!octal || str.length === 1) val = parseInt(str, 10);else if (/[89]/.test(str) || this.strict) this.raise(start, "Invalid number");else val = parseInt(str, 8);
+  return this.finishToken(_tokentype.types.num, val);
+};
+
+// Read a string value, interpreting backslash-escapes.
+
+pp.readCodePoint = function () {
+  var ch = this.input.charCodeAt(this.pos),
+      code = undefined;
+
+  if (ch === 123) {
+    if (this.options.ecmaVersion < 6) this.unexpected();
+    var codePos = ++this.pos;
+    code = this.readHexChar(this.input.indexOf('}', this.pos) - this.pos);
+    ++this.pos;
+    if (code > 0x10FFFF) this.raise(codePos, "Code point out of bounds");
+  } else {
+    code = this.readHexChar(4);
+  }
+  return code;
+};
+
+function codePointToString(code) {
+  // UTF-16 Decoding
+  if (code <= 0xFFFF) return String.fromCharCode(code);
+  code -= 0x10000;
+  return String.fromCharCode((code >> 10) + 0xD800, (code & 1023) + 0xDC00);
+}
+
+pp.readString = function (quote) {
+  var out = "",
+      chunkStart = ++this.pos;
+  for (;;) {
+    if (this.pos >= this.input.length) this.raise(this.start, "Unterminated string constant");
+    var ch = this.input.charCodeAt(this.pos);
+    if (ch === quote) break;
+    if (ch === 92) {
+      // '\'
+      out += this.input.slice(chunkStart, this.pos);
+      out += this.readEscapedChar(false);
+      chunkStart = this.pos;
+    } else {
+      if (_whitespace.isNewLine(ch)) this.raise(this.start, "Unterminated string constant");
+      ++this.pos;
+    }
+  }
+  out += this.input.slice(chunkStart, this.pos++);
+  return this.finishToken(_tokentype.types.string, out);
+};
+
+// Reads template string tokens.
+
+pp.readTmplToken = function () {
+  var out = "",
+      chunkStart = this.pos;
+  for (;;) {
+    if (this.pos >= this.input.length) this.raise(this.start, "Unterminated template");
+    var ch = this.input.charCodeAt(this.pos);
+    if (ch === 96 || ch === 36 && this.input.charCodeAt(this.pos + 1) === 123) {
+      // '`', '${'
+      if (this.pos === this.start && this.type === _tokentype.types.template) {
+        if (ch === 36) {
+          this.pos += 2;
+          return this.finishToken(_tokentype.types.dollarBraceL);
+        } else {
+          ++this.pos;
+          return this.finishToken(_tokentype.types.backQuote);
+        }
+      }
+      out += this.input.slice(chunkStart, this.pos);
+      return this.finishToken(_tokentype.types.template, out);
+    }
+    if (ch === 92) {
+      // '\'
+      out += this.input.slice(chunkStart, this.pos);
+      out += this.readEscapedChar(true);
+      chunkStart = this.pos;
+    } else if (_whitespace.isNewLine(ch)) {
+      out += this.input.slice(chunkStart, this.pos);
+      ++this.pos;
+      switch (ch) {
+        case 13:
+          if (this.input.charCodeAt(this.pos) === 10) ++this.pos;
+        case 10:
+          out += "\n";
+          break;
+        default:
+          out += String.fromCharCode(ch);
+          break;
+      }
+      if (this.options.locations) {
+        ++this.curLine;
+        this.lineStart = this.pos;
+      }
+      chunkStart = this.pos;
+    } else {
+      ++this.pos;
+    }
+  }
+};
+
+// Used to read escaped characters
+
+pp.readEscapedChar = function (inTemplate) {
+  var ch = this.input.charCodeAt(++this.pos);
+  ++this.pos;
+  switch (ch) {
+    case 110:
+      return "\n"; // 'n' -> '\n'
+    case 114:
+      return "\r"; // 'r' -> '\r'
+    case 120:
+      return String.fromCharCode(this.readHexChar(2)); // 'x'
+    case 117:
+      return codePointToString(this.readCodePoint()); // 'u'
+    case 116:
+      return "\t"; // 't' -> '\t'
+    case 98:
+      return "\b"; // 'b' -> '\b'
+    case 118:
+      return "\u000b"; // 'v' -> '\u000b'
+    case 102:
+      return "\f"; // 'f' -> '\f'
+    case 13:
+      if (this.input.charCodeAt(this.pos) === 10) ++this.pos; // '\r\n'
+    case 10:
+      // ' \n'
+      if (this.options.locations) {
+        this.lineStart = this.pos;++this.curLine;
+      }
+      return "";
+    default:
+      if (ch >= 48 && ch <= 55) {
+        var octalStr = this.input.substr(this.pos - 1, 3).match(/^[0-7]+/)[0];
+        var octal = parseInt(octalStr, 8);
+        if (octal > 255) {
+          octalStr = octalStr.slice(0, -1);
+          octal = parseInt(octalStr, 8);
+        }
+        if (octal > 0 && (this.strict || inTemplate)) {
+          this.raise(this.pos - 2, "Octal literal in strict mode");
+        }
+        this.pos += octalStr.length - 1;
+        return String.fromCharCode(octal);
+      }
+      return String.fromCharCode(ch);
+  }
+};
+
+// Used to read character escape sequences ('\x', '\u', '\U').
+
+pp.readHexChar = function (len) {
+  var codePos = this.pos;
+  var n = this.readInt(16, len);
+  if (n === null) this.raise(codePos, "Bad character escape sequence");
+  return n;
+};
+
+// Read an identifier, and return it as a string. Sets `this.containsEsc`
+// to whether the word contained a '\u' escape.
+//
+// Incrementally adds only escaped chars, adding other chunks as-is
+// as a micro-optimization.
+
+pp.readWord1 = function () {
+  this.containsEsc = false;
+  var word = "",
+      first = true,
+      chunkStart = this.pos;
+  var astral = this.options.ecmaVersion >= 6;
+  while (this.pos < this.input.length) {
+    var ch = this.fullCharCodeAtPos();
+    if (_identifier.isIdentifierChar(ch, astral)) {
+      this.pos += ch <= 0xffff ? 1 : 2;
+    } else if (ch === 92) {
+      // "\"
+      this.containsEsc = true;
+      word += this.input.slice(chunkStart, this.pos);
+      var escStart = this.pos;
+      if (this.input.charCodeAt(++this.pos) != 117) // "u"
+        this.raise(this.pos, "Expecting Unicode escape sequence \\uXXXX");
+      ++this.pos;
+      var esc = this.readCodePoint();
+      if (!(first ? _identifier.isIdentifierStart : _identifier.isIdentifierChar)(esc, astral)) this.raise(escStart, "Invalid Unicode escape");
+      word += codePointToString(esc);
+      chunkStart = this.pos;
+    } else {
+      break;
+    }
+    first = false;
+  }
+  return word + this.input.slice(chunkStart, this.pos);
+};
+
+// Read an identifier or keyword token. Will check for reserved
+// words when necessary.
+
+pp.readWord = function () {
+  var word = this.readWord1();
+  var type = _tokentype.types.name;
+  if ((this.options.ecmaVersion >= 6 || !this.containsEsc) && this.keywords.test(word)) type = _tokentype.keywords[word];
+  return this.finishToken(type, word);
+};
+
+},{"./identifier":2,"./locutil":5,"./state":10,"./tokentype":14,"./whitespace":16}],14:[function(_dereq_,module,exports){
+// ## Token types
+
+// The assignment of fine-grained, information-carrying type objects
+// allows the tokenizer to store the information it has about a
+// token in a way that is very cheap for the parser to look up.
+
+// All token type variables start with an underscore, to make them
+// easy to recognize.
+
+// The `beforeExpr` property is used to disambiguate between regular
+// expressions and divisions. It is set on all token types that can
+// be followed by an expression (thus, a slash after them would be a
+// regular expression).
+//
+// The `startsExpr` property is used to check if the token ends a
+// `yield` expression. It is set on all token types that either can
+// directly start an expression (like a quotation mark) or can
+// continue an expression (like the body of a string).
+//
+// `isLoop` marks a keyword as starting a loop, which is important
+// to know when parsing a label, in order to allow or disallow
+// continue jumps to that label.
+
+"use strict";
+
+exports.__esModule = true;
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+var TokenType = function TokenType(label) {
+  var conf = arguments.length <= 1 || arguments[1] === undefined ? {} : arguments[1];
+
+  _classCallCheck(this, TokenType);
+
+  this.label = label;
+  this.keyword = conf.keyword;
+  this.beforeExpr = !!conf.beforeExpr;
+  this.startsExpr = !!conf.startsExpr;
+  this.isLoop = !!conf.isLoop;
+  this.isAssign = !!conf.isAssign;
+  this.prefix = !!conf.prefix;
+  this.postfix = !!conf.postfix;
+  this.binop = conf.binop || null;
+  this.updateContext = null;
+};
+
+exports.TokenType = TokenType;
+
+function binop(name, prec) {
+  return new TokenType(name, { beforeExpr: true, binop: prec });
+}
+var beforeExpr = { beforeExpr: true },
+    startsExpr = { startsExpr: true };
+
+var types = {
+  num: new TokenType("num", startsExpr),
+  regexp: new TokenType("regexp", startsExpr),
+  string: new TokenType("string", startsExpr),
+  name: new TokenType("name", startsExpr),
+  eof: new TokenType("eof"),
+
+  // Punctuation token types.
+  bracketL: new TokenType("[", { beforeExpr: true, startsExpr: true }),
+  bracketR: new TokenType("]"),
+  braceL: new TokenType("{", { beforeExpr: true, startsExpr: true }),
+  braceR: new TokenType("}"),
+  parenL: new TokenType("(", { beforeExpr: true, startsExpr: true }),
+  parenR: new TokenType(")"),
+  comma: new TokenType(",", beforeExpr),
+  semi: new TokenType(";", beforeExpr),
+  colon: new TokenType(":", beforeExpr),
+  dot: new TokenType("."),
+  question: new TokenType("?", beforeExpr),
+  arrow: new TokenType("=>", beforeExpr),
+  template: new TokenType("template"),
+  ellipsis: new TokenType("...", beforeExpr),
+  backQuote: new TokenType("`", startsExpr),
+  dollarBraceL: new TokenType("${", { beforeExpr: true, startsExpr: true }),
+
+  // Operators. These carry several kinds of properties to help the
+  // parser use them properly (the presence of these properties is
+  // what categorizes them as operators).
+  //
+  // `binop`, when present, specifies that this operator is a binary
+  // operator, and will refer to its precedence.
+  //
+  // `prefix` and `postfix` mark the operator as a prefix or postfix
+  // unary operator.
+  //
+  // `isAssign` marks all of `=`, `+=`, `-=` etcetera, which act as
+  // binary operators with a very low precedence, that should result
+  // in AssignmentExpression nodes.
+
+  eq: new TokenType("=", { beforeExpr: true, isAssign: true }),
+  assign: new TokenType("_=", { beforeExpr: true, isAssign: true }),
+  incDec: new TokenType("++/--", { prefix: true, postfix: true, startsExpr: true }),
+  prefix: new TokenType("prefix", { beforeExpr: true, prefix: true, startsExpr: true }),
+  logicalOR: binop("||", 1),
+  logicalAND: binop("&&", 2),
+  bitwiseOR: binop("|", 3),
+  bitwiseXOR: binop("^", 4),
+  bitwiseAND: binop("&", 5),
+  equality: binop("==/!=", 6),
+  relational: binop("</>", 7),
+  bitShift: binop("<</>>", 8),
+  plusMin: new TokenType("+/-", { beforeExpr: true, binop: 9, prefix: true, startsExpr: true }),
+  modulo: binop("%", 10),
+  star: binop("*", 10),
+  slash: binop("/", 10)
+};
+
+exports.types = types;
+// Map keyword names to token types.
+
+var keywords = {};
+
+exports.keywords = keywords;
+// Succinct definitions of keyword token types
+function kw(name) {
+  var options = arguments.length <= 1 || arguments[1] === undefined ? {} : arguments[1];
+
+  options.keyword = name;
+  keywords[name] = types["_" + name] = new TokenType(name, options);
+}
+
+kw("break");
+kw("case", beforeExpr);
+kw("catch");
+kw("continue");
+kw("debugger");
+kw("default", beforeExpr);
+kw("do", { isLoop: true, beforeExpr: true });
+kw("else", beforeExpr);
+kw("finally");
+kw("for", { isLoop: true });
+kw("function", startsExpr);
+kw("if");
+kw("return", beforeExpr);
+kw("switch");
+kw("throw", beforeExpr);
+kw("try");
+kw("var");
+kw("let");
+kw("const");
+kw("while", { isLoop: true });
+kw("with");
+kw("new", { beforeExpr: true, startsExpr: true });
+kw("this", startsExpr);
+kw("super", startsExpr);
+kw("class");
+kw("extends", beforeExpr);
+kw("export");
+kw("import");
+kw("yield", { beforeExpr: true, startsExpr: true });
+kw("null", startsExpr);
+kw("true", startsExpr);
+kw("false", startsExpr);
+kw("in", { beforeExpr: true, binop: 7 });
+kw("instanceof", { beforeExpr: true, binop: 7 });
+kw("typeof", { beforeExpr: true, prefix: true, startsExpr: true });
+kw("void", { beforeExpr: true, prefix: true, startsExpr: true });
+kw("delete", { beforeExpr: true, prefix: true, startsExpr: true });
+
+},{}],15:[function(_dereq_,module,exports){
+"use strict";
+
+exports.__esModule = true;
+exports.isArray = isArray;
+exports.has = has;
+
+function isArray(obj) {
+  return Object.prototype.toString.call(obj) === "[object Array]";
+}
+
+// Checks if an object has a property.
+
+function has(obj, propName) {
+  return Object.prototype.hasOwnProperty.call(obj, propName);
+}
+
+},{}],16:[function(_dereq_,module,exports){
+// Matches a whole line break (where CRLF is considered a single
+// line break). Used to count lines.
+
+"use strict";
+
+exports.__esModule = true;
+exports.isNewLine = isNewLine;
+var lineBreak = /\r\n?|\n|\u2028|\u2029/;
+exports.lineBreak = lineBreak;
+var lineBreakG = new RegExp(lineBreak.source, "g");
+
+exports.lineBreakG = lineBreakG;
+
+function isNewLine(code) {
+  return code === 10 || code === 13 || code === 0x2028 || code == 0x2029;
+}
+
+var nonASCIIwhitespace = /[\u1680\u180e\u2000-\u200a\u202f\u205f\u3000\ufeff]/;
+exports.nonASCIIwhitespace = nonASCIIwhitespace;
+
+},{}]},{},[3])(3)
+});
\ No newline at end of file