harmony-scoping: make assignment to 'const' a late error.

src/variables.h

Index: src/variables.h
diff --git a/src/variables.h b/src/variables.h
index 93bfb4a1816aeb3fb9f370c847ace86da6f2d6b3..d150e0fa30d4a6f6632d3493a17de3c96fc41ff8 100644
--- a/src/variables.h
+++ b/src/variables.h
@@ -135,6 +135,19 @@ class Variable: public ZoneObject {
 
   static int CompareIndex(Variable* const* v, Variable* const* w);
 
+  // Shall an error be thrown if assignment with 'op' operation is perfomed
+  // on this variable in given language mode?
+  bool IsSignallingAssignmentToConst(Token::Value op,

[rossberg, 2014/11/26 08:31:46]

Can you also move this to full-codegen.h? This is compilation logic for
assignments, and should not pollute the variable interface.

[Dmitry Lomov (no reviews), 2014/11/26 10:30:56]

Done.

+                                     StrictMode strict_mode) const {
+    if (strict_mode == SLOPPY) return false;
+
+    if (mode() == CONST) return op != Token::INIT_CONST;
+
+    if (mode() == CONST_LEGACY) return op != Token::INIT_CONST_LEGACY;
+
+    return false;
+  }
+
  private:
   Scope* scope_;
   const AstRawString* name_;