Prohibit let in lexical bindings

test/mjsunit/messages.js

Index: test/mjsunit/messages.js
diff --git a/test/mjsunit/messages.js b/test/mjsunit/messages.js
index b8c3114d3685574d3236df28f46bc8bfdffb65c4..7d7ca182c57992119bfbb32c4ec62f188aab11fc 100644
--- a/test/mjsunit/messages.js
+++ b/test/mjsunit/messages.js
@@ -3,7 +3,7 @@
 // found in the LICENSE file.
 
 // Flags: --stack-size=100 --harmony --harmony-reflect --harmony-regexps
-// Flags: --harmony-simd --strong-mode
+// Flags: --harmony-simd --strong-mode --harmony-sloppy --harmony-sloppy-let
 
 function test(f, expected, type) {
   try {
@@ -470,3 +470,8 @@ test(function() {
 test(function() {
   decodeURI("%%");
 }, "URI malformed", URIError);
+
+// kLetInLexicalBinding

[adamk, 2015/10/05 16:30:48]

Sorry, this isn't quite what I meant. You should add a new test file under

test/message/let-in-lexical-binding.js

and an expectation  in

test/message/let-in-lexical-binding.out

That's how we've been doing early error testing.

+test(function() {
+  eval('let let');
+}, "let is disallowed as a lexically bound name", SyntaxError);