Strict mode delete of unqualified identifier.

src/parser.cc

Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index 04d510f2fdcf174fe9615e7e871fc20ae236ff2d..036ec4060d06f8db001e632d1e2e0bcdd87b2f77 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -2521,6 +2521,16 @@ Expression* Parser::ParseUnaryExpression(bool* ok) {
       }
     }
 
+    // "delete identifier" is a syntax error in strict mode.
+    if (op == Token::DELETE && temp_scope_->StrictMode()) {
+      VariableProxy* operand = expression->AsVariableProxy();
+      if (operand != NULL && !operand->is_this()) {
+        ReportMessage("strict_delete", Vector<const char*>::empty());
+        *ok = false;
+        return NULL;
+      }
+    }
+
     return new UnaryOperation(op, expression);
 
   } else if (Token::IsCountOp(op)) {