[parser] Enforce module-specific identifier restriction

src/ast/scopes.cc

Index: src/ast/scopes.cc
diff --git a/src/ast/scopes.cc b/src/ast/scopes.cc
index 7c87ce39e95a44a8f8e8e1932b1a3f67b16e1d8f..bb5581bd28f040725dfc45cfaf12674205137e86 100644
--- a/src/ast/scopes.cc
+++ b/src/ast/scopes.cc
@@ -171,6 +171,7 @@ void Scope::SetDefaults(ScopeType scope_type, Scope* outer_scope,
   this_function_ = nullptr;
   illegal_redecl_ = nullptr;
   scope_inside_with_ = false;
+  scope_inside_module_ = false;
   scope_contains_with_ = false;
   scope_calls_eval_ = false;
   scope_uses_arguments_ = false;
@@ -311,8 +312,11 @@ void Scope::Initialize() {
   if (outer_scope_ != NULL) {
     outer_scope_->inner_scopes_.Add(this, zone());
     scope_inside_with_ = outer_scope_->scope_inside_with_ || is_with_scope();
+    scope_inside_module_ =
+        outer_scope_->scope_inside_module_ || is_module_scope();
   } else {
     scope_inside_with_ = is_with_scope();
+    scope_inside_module_ = is_module_scope();
   }
 
   // Declare convenience variables and the receiver.
@@ -999,6 +1003,7 @@ void Scope::Print(int n) {
     Indent(n1, "// strict mode scope\n");
   }
   if (scope_inside_with_) Indent(n1, "// scope inside 'with'\n");
+  if (scope_inside_module_) Indent(n1, "// scope inside module code\n");
   if (scope_contains_with_) Indent(n1, "// scope contains 'with'\n");
   if (scope_calls_eval_) Indent(n1, "// scope calls 'eval'\n");
   if (scope_uses_arguments_) Indent(n1, "// scope uses 'arguments'\n");