[debug] use correct language mode when parsing eval for scope iterator.

src/debug/debug-scopes.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/debug/debug-scopes.h"
 
 #include "src/ast/scopes.h"
 #include "src/compiler.h"
 #include "src/debug/debug.h"
 #include "src/frames-inl.h"
@@ skipping 79 matching lines @@
     // Global or eval code.
     Handle<Script> script(Script::cast(shared_info->script()));
     info.Reset(new ParseInfo(&zone, script));
     info->set_toplevel();
     if (scope_info->scope_type() == SCRIPT_SCOPE) {
       info->set_global();
     } else {
       DCHECK(scope_info->scope_type() == EVAL_SCOPE);
       info->set_eval();
       info->set_context(Handle<Context>(function->context()));
+      // Language mode may be inherited from the eval caller.
+      // Retrieve it from shared function info.
+      info->set_language_mode(shared_info->language_mode());
     }
   } else {
     // Inner function.
     info.Reset(new ParseInfo(&zone, function));
   }
   Scope* scope = NULL;
   if (Compiler::ParseAndAnalyze(info.get())) scope = info->literal()->scope();
   if (!ignore_nested_scopes) RetrieveScopeChain(scope);
   if (collect_non_locals) CollectNonLocals(scope);
   UnwrapEvaluationContext();
@@ skipping 693 matching lines @@
     DCHECK((beg_pos >= 0 && end_pos >= 0) || inner_scope->is_hidden());
     if (beg_pos <= position && position < end_pos) {
       GetNestedScopeChain(isolate, inner_scope, position);
       return;
     }
   }
 }
 
 }  // namespace internal
 }  // namespace v8