Hide ClosureMirror.findInContext behind a flag for 1.0.

sdk/lib/mirrors/mirrors.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.
 
 // For the purposes of the mirrors library, we adopt a naming
 // convention with respect to getters and setters.  Specifically, for
 // some variable or field...
 //
 //   var myField;
 //
@@ skipping 521 matching lines @@
    * the result of calling [reflect](*r*).
    * If the invocation causes a compilation error
    * this method throws a [MirrorError].
    * If the invocation throws an exception *e* (that it does not catch)
    * this method throws *e*.
    */
   InstanceMirror apply(List positionalArguments,
                        [Map<Symbol, dynamic> namedArguments]);
 
   /**
-   * Looks up the value of a name in the scope of the closure. The
-   * result is a mirror on that value.
-   *
-   * Let *s* be the contents of the string used to construct the symbol [name].
-   *
-   * If the expression *s* occurs within the source code of the reflectee,
-   * and if any such occurrence refers to a declaration outside the reflectee,
-   * then let *v* be the result of evaluating the expression *s* at such
-   * an occurrence.
-   * If *s = this*, and the reflectee was defined within the instance scope of
-   * an object *o*, then let *v* be *o*.
-   *
-   * The returned value is the result of invoking the method [reflect] on
-   * *v*.
+   * Not yet supported. Calling this method throws an [UnsupportedError].
    */
   InstanceMirror findInContext(Symbol name, {ifAbsent: null});
 }
 
 /**
  * A [LibraryMirror] reflects a Dart language library, providing
  * access to the variables, functions, and classes of the
  * library.
  */
 abstract class LibraryMirror implements DeclarationMirror, ObjectMirror {
@@ skipping 629 matching lines @@
    *
    * When used as metadata on an import of "dart:mirrors", this metadata does
    * not apply to the library in which the annotation is used, but instead
    * applies to the other libraries (all libraries if "*" is used).
    */
   final override;
 
   const MirrorsUsed(
       {this.symbols, this.targets, this.metaTargets, this.override});
 }