First steps toward removing MethodTrampoline

pkg/analyzer/test/generated/test_support.dart

Index: pkg/analyzer/test/generated/test_support.dart
diff --git a/pkg/analyzer/test/generated/test_support.dart b/pkg/analyzer/test/generated/test_support.dart
index 4242bc5031af92e3033cb847a22b6bc2dbc2e8c1..7b3677041c7f9c8574c4cc768b5152cbf1d8996a 100644
--- a/pkg/analyzer/test/generated/test_support.dart
+++ b/pkg/analyzer/test/generated/test_support.dart
@@ -416,17 +416,16 @@ class GatheringErrorListener implements AnalysisErrorListener {
   }
 
   /**
-   * 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.