Convert raw strings in compiler

lib/compiler/implementation/elements/elements.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('elements');
 
 #import('dart:uri');
 
 #import('../tree/tree.dart');
 #import('../scanner/scannerlib.dart');
@@ skipping 1580 matching lines @@
   }
 
   static SourceString constructConstructorName(SourceString receiver,
                                                SourceString selector) {
     String r = receiver.slowToString();
     String s = selector.slowToString();
     return new SourceString('$r\$$s');
   }
 
   static const SourceString OPERATOR_EQUALS =
-      const SourceString(@'operator$eq');
+      const SourceString(r'operator$eq');
 
   static SourceString constructOperatorName(SourceString selector,
                                             bool isUnary) {
     String str = selector.stringValue;
     if (str === '==' || str === '!=') return OPERATOR_EQUALS;
 
     if (str === '~') {
       str = 'not';
     } else if (str === '-' && isUnary) {
       // TODO(ahe): Return something like 'unary -'.
@@ skipping 180 matching lines @@
 
   MetadataAnnotation ensureResolved(Compiler compiler) {
     if (resolutionState == STATE_NOT_STARTED) {
       compiler.resolver.resolveMetadataAnnotation(this);
     }
     return this;
   }
 
   String toString() => 'MetadataAnnotation($value, $resolutionState)';
 }