1 files changed, 54 insertions, 0 deletions
diff --git a/js/src/tests/ecma_6/Syntax/yield-as-identifier.js b/js/src/tests/ecma_6/Syntax/yield-as-identifier.js
new file mode 100644
index 000000000..665b0b11c
--- /dev/null
+++ b/js/src/tests/ecma_6/Syntax/yield-as-identifier.js
@@ -0,0 +1,54 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 1288459;
+var summary = "|yield| is sometimes a valid identifier";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+function t(code)
+{
+  var strictSemi = " 'use strict'; " + code;
+  var strictASI = " 'use strict' \n " + code;
+
+  var creationFunctions = ["Function"];
+  if (typeof evaluate === "function")
+    creationFunctions.push("evaluate");
+  if (typeof parseModule === "function")
+    creationFunctions.push("parseModule");
+
+  for (var func of creationFunctions)
+  {
+    var g = newGlobal();
+    var f = g[func];
+
+    if (func === "parseModule")
+      assertThrowsInstanceOf(() => f(code), g.SyntaxError);
+    else
+      f(code);
+
+    assertThrowsInstanceOf(() => f(strictSemi), g.SyntaxError);
+    assertThrowsInstanceOf(() => f(strictASI), g.SyntaxError);
+  }
+}
+
+t("var yield = 3;");
+t("let yield = 3;");
+t("const yield = 3;");
+t("for (var yield = 3; ; ) break;");
+t("for (let yield = 3; ; ) break;");
+t("for (const yield = 3; ; ) break;");
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete");