1 files changed, 36 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/arguments/defaults-scoping.js b/js/src/jit-test/tests/arguments/defaults-scoping.js
new file mode 100644
index 000000000..366439590
--- /dev/null
+++ b/js/src/jit-test/tests/arguments/defaults-scoping.js
@@ -0,0 +1,36 @@
+load(libdir + "asserts.js");
+
+var x = 'global';
+function f(a=x) {  // global variable x
+    var x = 'local';
+    return a;
+}
+assertEq(f(), 'global');
+
+var i = 42;
+function g(f=function () { return ++i; }) {  // closes on global variable i
+    var i = 0;
+    return f;
+}
+var gf = g();
+assertEq(gf(), 43);
+assertEq(gf(), 44);
+gf = g();
+assertEq(gf(), 45);
+
+function h(f=function (s) { return eval(s); }) {  // closes on global scope
+    var x = 'hlocal';
+    return f;
+}
+var hf = h();
+assertEq(hf('x'), 'global');
+assertEq(hf('f'), hf);
+assertEq(hf('var x = 3; x'), 3);
+
+function j(expr, v=eval(expr)) {
+  return v;
+}
+assertEq(j("expr"), "expr");
+assertThrowsInstanceOf(() => j("v"), ReferenceError);
+assertEq(j("Array"), Array);
+assertEq(j("arguments").length, 1);