Don't crash on deserialized type inference.

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

 // Copyright (c) 2012, 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.
 
 library dart2js.common.resolution;
 
 import '../common.dart';
 import '../compiler.dart' show Compiler;
 import '../constants/expressions.dart' show ConstantExpression;
 import '../core_types.dart' show CoreTypes;
 import '../dart_types.dart' show DartType, InterfaceType;
 import '../elements/elements.dart'
     show
         AstElement,
         ClassElement,
         Element,
+        ExecutableElement,
         FunctionElement,
         FunctionSignature,
         MetadataAnnotation,
         ResolvedAst,
         TypedefElement;
 import '../enqueue.dart' show ResolutionEnqueuer;
 import '../options.dart' show ParserOptions;
 import '../parser/element_listener.dart' show ScannerOptions;
 import '../parser/parser_task.dart';
 import '../patch_parser.dart';
@@ skipping 155 matching lines @@
 
   String toString() {
     return 'ListLiteralUse($type,isConstant:$isConstant,isEmpty:$isEmpty)';
   }
 }
 
 /// Interface for the accessing the front-end analysis.
 // TODO(johnniwinther): Find a better name for this.
 abstract class Frontend {
   /// Returns `true` if [element] has a [ResolvedAst].
-  bool hasResolvedAst(Element element);
+  bool hasResolvedAst(ExecutableElement element);
 
   /// Returns the `ResolvedAst` for the [element].
-  ResolvedAst getResolvedAst(Element element);
+  ResolvedAst getResolvedAst(ExecutableElement element);
 
   /// Returns the [ResolutionImpact] for [element].
   ResolutionImpact getResolutionImpact(Element element);
 }
 
 // TODO(johnniwinther): Rename to `Resolver` or `ResolverContext`.
 abstract class Resolution implements Frontend {
   ParsingContext get parsingContext;
   DiagnosticReporter get reporter;
   CoreTypes get coreTypes;
@@ skipping 15 matching lines @@
   // return `false`.
   bool hasBeenResolved(Element element);
 
   /// Resolve [element] if it has not already been resolved.
   void ensureResolved(Element element);
 
   ResolutionWorkItem createWorkItem(
       Element element, ItemCompilationContext compilationContext);
 
   /// Returns `true` if [element] as a fully computed [ResolvedAst].
-  bool hasResolvedAst(Element element);
+  bool hasResolvedAst(ExecutableElement element);
 
   /// Returns the `ResolvedAst` for the [element].
-  ResolvedAst getResolvedAst(Element element);
+  ResolvedAst getResolvedAst(ExecutableElement element);
 
   /// Returns `true` if the [ResolutionImpact] for [element] is cached.
   bool hasResolutionImpact(Element element);
 
   /// Returns the precomputed [ResolutionImpact] for [element].
   ResolutionImpact getResolutionImpact(Element element);
 
   /// Returns the [ResolvedAst] for [element], computing it if necessary.
   ResolvedAst computeResolvedAst(Element element);
 
@@ skipping 60 matching lines @@
       if (cls.isPatch) {
         patchParser.parsePatchClassNode(cls);
       }
     });
   }
 
   @override
   ScannerOptions getScannerOptionsFor(Element element) => new ScannerOptions(
       canUseNative: backend.canLibraryUseNative(element.library));
 }