First steps toward removing MethodTrampoline

pkg/analyzer/test/generated/test_support.dart

 // Copyright (c) 2014, 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 analyzer.test.generated.test_support;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart' show AstNode, SimpleIdentifier;
 import 'package:analyzer/dart/element/element.dart';
@@ skipping 398 matching lines @@
    * Set the line information associated with the given source to the given information.
    *
    * @param source the source with which the line information is associated
    * @param lineStarts the line start information to be associated with the source
    */
   void setLineInfo(Source source, List<int> lineStarts) {
     _lineInfoMap[source] = new LineInfo(lineStarts);
   }
 
   /**
-   * Return `true` if the two errors are equivalent.
-   *
-   * @param firstError the first error being compared
-   * @param secondError the second error being compared
-   * @return `true` if the two errors are equivalent
+   * Return `true` if the [actualError] matches the [expectedError].
    */
-  bool _equalErrors(AnalysisError firstError, AnalysisError secondError) =>
-      identical(firstError.errorCode, secondError.errorCode) &&
-      firstError.offset == secondError.offset &&
-      firstError.length == secondError.length &&
-      _equalSources(firstError.source, secondError.source);
+  bool _equalErrors(AnalysisError expectedError, AnalysisError actualError) {
+    Source expectedSource = expectedError.source;
+    return identical(expectedError.errorCode, actualError.errorCode) &&
+        expectedError.offset == actualError.offset &&
+        expectedError.length == actualError.length &&
+        (expectedSource == null ||
+            _equalSources(expectedSource, actualError.source));
+  }
 
   /**
    * Return `true` if the two sources are equivalent.
    *
    * @param firstSource the first source being compared
    * @param secondSource the second source being compared
    * @return `true` if the two sources are equivalent
    */
   bool _equalSources(Source firstSource, Source secondSource) {
     if (firstSource == null) {
@@ skipping 198 matching lines @@
     return UriKind.FILE_URI;
   }
 
   bool operator ==(Object other) {
     if (other is TestSource) {
       return other.uri == uri;
     }
     return false;
   }
 }