Add mirrors_reader_test.

sdk/lib/_internal/compiler/implementation/compiler.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.
 
 part of dart2js;
 
 /**
  * If true, print a warning for each method that was resolved, but not
  * compiled.
  */
@@ skipping 481 matching lines @@
    * error occurs then report it as having occurred during compilation of
    * [element].  Can be nested.
    */
   withCurrentElement(Element element, f()) {
     Element old = currentElement;
     _currentElement = element;
     try {
       return f();
     } on SpannableAssertionFailure catch (ex) {
       if (!hasCrashed) {
-        String message = (ex.message != null) ? tryToString(ex.message)
-                                              : tryToString(ex);
-        SourceSpan span = spanFromSpannable(ex.node);
-        reportError(ex.node, MessageKind.GENERIC, {'text': message});
+        reportAssertionFailure(ex);
         pleaseReportCrash();
       }
       hasCrashed = true;
       rethrow;
     } on CompilerCancelledException catch (ex) {
       rethrow;
     } on StackOverflowError catch (ex) {
       // We cannot report anything useful in this case, because we
       // do not have enough stack space.
       rethrow;
@@ skipping 874 matching lines @@
   }
 
   void reportMessage(SourceSpan span, Diagnostic message, api.Diagnostic kind) {
     // TODO(ahe): The names Diagnostic and api.Diagnostic are in
     // conflict. Fix it.
     reportDiagnostic(span, "$message", kind);
   }
 
   void reportDiagnostic(SourceSpan span, String message, api.Diagnostic kind);
 
+  void reportAssertionFailure(SpannableAssertionFailure ex) {
+    String message = (ex.message != null) ? tryToString(ex.message)
+                                          : tryToString(ex);
+    SourceSpan span = spanFromSpannable(ex.node);
+    reportError(ex.node, MessageKind.GENERIC, {'text': message});
+  }
+
   SourceSpan spanFromTokens(Token begin, Token end, [Uri uri]) {
     if (begin == null || end == null) {
       // TODO(ahe): We can almost always do better. Often it is only
       // end that is null. Otherwise, we probably know the current
       // URI.
       throw 'Cannot find tokens to produce error message.';
     }
     if (uri == null && currentElement != null) {
       uri = currentElement.getCompilationUnit().script.uri;
     }
@@ skipping 320 matching lines @@
 
   void close() {}
 
   toString() => name;
 
   /// Convenience method for getting an [api.CompilerOutputProvider].
   static NullSink outputProvider(String name, String extension) {
     return new NullSink('$name.$extension');
   }
 }