Throw when reflecting on elements not covered by a `MirrorsUsed` annotation.

sdk/lib/_internal/compiler/implementation/mirrors_used.dart

 // Copyright (c) 2013, 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 dart2js.mirrors_used;
 
 import 'dart2jslib.dart' show
     Compiler,
     CompilerTask,
     Constant,
@@ skipping 544 matching lines @@
       current = e;
     }
     return current;
   }
 
   /// Helper method to lookup members in a [ScopeContainerElement]. If
   /// [element] is not a ScopeContainerElement, return null.
   Element findLocalMemberIn(Element element, SourceString name) {
     if (element is ScopeContainerElement) {
       ScopeContainerElement scope = element;
+      if (element.isClass()) {
+        ClassElement cls = element;
+        cls.ensureResolved(compiler);
+      }
       return scope.localLookup(name);
     }
     return null;
   }
 
   /// Attempt to find a [Spannable] corresponding to constant.
   Spannable positionOf(Constant constant) {
     Node node = constantToNodeMap[constant];
     if (node == null) {
       // TODO(ahe): Returning [spannable] here leads to confusing error
@@ skipping 11 matching lines @@
       // @MirrorsUsed(targets: fisk)
       //                       ^^^^
       //
       // Instead of saying 'fisk' should pretty print the problematic constant
       // value.
       return spannable;
     }
     return node;
   }
 }