[parser] Disallow Expression in for..of statements

test/mjsunit/es6/iteration-syntax.js

Index: test/mjsunit/es6/iteration-syntax.js
diff --git a/test/mjsunit/es6/iteration-syntax.js b/test/mjsunit/es6/iteration-syntax.js
index c6a7d477bc747e3a2061f19179963e1ade60d200..64bcc2f8470750037c7ee7ccde579a1bbe2a5176 100644
--- a/test/mjsunit/es6/iteration-syntax.js
+++ b/test/mjsunit/es6/iteration-syntax.js
@@ -66,6 +66,9 @@ StrictSyntaxError("function f() { for (x = 3 of y) { } }");
 StrictSyntaxError("function f() { for (var x = 3 of y) { } }");
 StrictSyntaxError("function f() { for (let x = 3 of y) { } }");
 
+StrictSyntaxError("function f() { for (x of y, z) { } }");

[adamk, 2016/01/19 22:21:47]

Rather than adding tests here (which limits you not just to the parser but also
to strict mode), please add a new test case to test/cctest/test-parsing.cc

Take a look at TEST(ConstParsingForInError) for a good starting point.

+StrictSyntaxError("function f() { for (var x of y, z) { } }");
+StrictSyntaxError("function f() { for (let x of y, z) { } }");
 
 // Alack, this appears to be valid.
 function f() { for (of of y) { } }