Fix getField optimization when the selector is an operator.

runtime/lib/mirrors_impl.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.
 
 // VM-specific implementation of the dart:mirrors library.
 
 import "dart:collection" show UnmodifiableListView, UnmodifiableMapView;
 import "dart:async" show Future;
 
 var dirty = false;
@@ skipping 429 matching lines @@
       return _eval('(x) => x.$withoutKey', privateKey);
     }
   }
 
   _getFieldSlow(unwrapped) {
     // Slow path factored out to give the fast path a better chance at being
     // inlined.
     var result = reflect(_invokeGetter(_reflectee, unwrapped));
     // Wait until success to avoid creating closures for non-existent getters,
     // and defer the creation until the next getField invocation.
-    _getFieldClosures[unwrapped] = (receiver) {
-      var getterClosure = _createGetterClosure(unwrapped);
-      _getFieldClosures[unwrapped] = getterClosure;
-      return getterClosure(receiver);
-    };
+    // o.<operator> is not valid Dart and will cause a compilation error, so
+    // don't attempt to generate such a closure.
+    bool isOperator = _LocalMethodMirror._operators.contains(unwrapped);
+    if (!isOperator) {
+      _getFieldClosures[unwrapped] = (receiver) {
+        var getterClosure = _createGetterClosure(unwrapped);
+        _getFieldClosures[unwrapped] = getterClosure;
+        return getterClosure(receiver);
+      };
+    }
     return result;
   }
 
   InstanceMirror getField(Symbol memberName) {
     var unwrapped = _n(memberName);
     var f = _getFieldClosures[unwrapped];
     return (f == null) ? _getFieldSlow(unwrapped) : reflect(f(_reflectee));
   }
 
   _createSetterClosure(unwrapped) {
@@ skipping 1194 matching lines @@
     if (typeMirror == null) {
       typeMirror = makeLocalTypeMirror(key);
       _instanitationCache[key] = typeMirror;
       if (typeMirror is ClassMirror && !typeMirror._isGeneric) {
         _declarationCache[key] = typeMirror;
       }
     }
     return typeMirror;
   }
 }