Introduce .isMalformed

pkg/compiler/lib/src/elements/common.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// Mixins that implement convenience methods on [Element] subclasses.
 
 library elements.common;
 
 import '../common/names.dart' show
     Names,
@@ skipping 58 matching lines @@
   @override
   bool get isAbstractField => kind == ElementKind.ABSTRACT_FIELD;
 
   @override
   bool get isParameter => kind == ElementKind.PARAMETER;
 
   @override
   bool get isInitializingFormal => kind == ElementKind.INITIALIZING_FORMAL;
 
   @override
-  bool get isErroneous => kind == ElementKind.ERROR;
+  bool get isError => kind == ElementKind.ERROR;
 
   @override
   bool get isAmbiguous => kind == ElementKind.AMBIGUOUS;
 
   @override
+  bool get isMalformed => false;
+
+  @override
   bool get isWarnOnUse => kind == ElementKind.WARN_ON_USE;
 
   @override
   bool get impliesType => (kind.category & ElementCategory.IMPLIES_TYPE) != 0;
 
   @override
   Element get declaration => this;
 
   @override
   Element get implementation => this;
@@ skipping 389 matching lines @@
       // this signature must not have more required parameters.  Having more
       // optional parameters is not a problem, they simply are never provided
       // by call sites of a call to a method with the other signature.
       int otherTotalCount = signature.parameterCount;
       return requiredParameterCount <= otherTotalCount
           && parameterCount >= otherTotalCount;
     }
     return true;
   }
 }