Detect conflicting variable bindings in harmony mode.

src/parser.h

Index: src/parser.h
diff --git a/src/parser.h b/src/parser.h
index 686dac85afa81bde06b5d07099e4268372e3e754..eac28f612b6abf423cf07ef29a1a03b277e81a03 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -645,6 +645,11 @@ class Parser {
   // Strict mode octal literal validation.
   void CheckOctalLiteral(int beg_pos, int end_pos, bool* ok);
 
+  // For harmony block scoping mode: Check if the scope has conflicting var
+  // declarations, i.e. a var declaration that has been hoisted from a nested
+  // scope over a let binding of the same name.

[Lasse Reichstein, 2011/09/01 07:34:04]

Be more explicit (define what you mean by "over", or, prefereably, don't say
anything about hoisting - just say what the invalid syntax structure is).
Am I understanding it correctly if the invalid case is:
A var declaration inside a nested scope/block of a scope with a
let(/const/function)-declaration of the same name. I.e., it doesn't check for
redeclaration in the same scope (that's handled inline)?

[Steven, 2011/09/01 15:01:33]

Done.

+  void CheckConflictingVarDeclarations(Scope* scope, bool* ok);
+
   // Parser support
   VariableProxy* Declare(Handle<String> name, Variable::Mode mode,
                          FunctionLiteral* fun,