Register closures using StaticUse.

pkg/compiler/lib/src/universe/use.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.
 
 /// This library defined `uses`. A `use` is a single impact of the world, for
 /// instance an invocation of a top level function or a call to the `foo()`
 /// method on an unknown class.
 library dart2js.universe.use;
 
 import '../closure.dart' show
@@ skipping 54 matching lines @@
 
   String toString() => '$selector,$mask';
 }
 
 enum StaticUseKind {
   GENERAL,
   STATIC_TEAR_OFF,
   SUPER_TEAR_OFF,
   FIELD_GET,
   FIELD_SET,
+  CLOSURE,
 }
 
 /// Statically known use of an [Element].
 // TODO(johnniwinther): Create backend-specific implementations with better
 // invariants.
 class StaticUse {
   final Element element;
   final StaticUseKind kind;
   final int hashCode;
 
@@ skipping 140 matching lines @@
 
   /// Write access of an instance field or boxed field [element].
   factory StaticUse.fieldSet(Element element) {
     assert(invariant(element,
         element.isInstanceMember || element is BoxFieldElement,
         message: "Field init element $element must be an instance "
                  "or boxed field."));
     return new StaticUse._(element, StaticUseKind.FIELD_SET);
   }
 
+  /// Read of a local function [element].
+  factory StaticUse.closure(LocalFunctionElement element) {
+    return new StaticUse._(element, StaticUseKind.CLOSURE);
+  }
+
   /// Unknown use of [element].
   @deprecated
   factory StaticUse.foreignUse(Element element) {
     return new StaticUse._(element, StaticUseKind.GENERAL);
   }
 
   bool operator ==(other) {
     if (identical(this, other)) return true;
     if (other is! StaticUse) return false;
     return element == other.element &&
@@ skipping 55 matching lines @@
 
   bool operator ==(other) {
     if (identical(this, other)) return true;
     if (other is! TypeUse) return false;
     return type == other.type &&
            kind == other.kind;
   }
 
   String toString() => 'TypeUse($type,$kind)';
 }