Support per-library serialization.

pkg/compiler/lib/src/elements/common.dart

 // Copyright (c) 2015, 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.
 
 /// Mixins that implement convenience methods on [Element] subclasses.
 
 library elements.common;
 
 import '../common/names.dart' show
     Names,
@@ skipping 492 matching lines @@
       // this signature must not have more required parameters.  Having more
       // optional parameters is not a problem, they simply are never provided
       // by call sites of a call to a method with the other signature.
       int otherTotalCount = signature.parameterCount;
       return requiredParameterCount <= otherTotalCount
           && parameterCount >= otherTotalCount;
     }
     return true;
   }
 }
+
+abstract class MixinApplicationElementCommon
+    implements MixinApplicationElement {
+  Link<ConstructorElement> get constructors {
+    throw new UnsupportedError('Unimplemented $this.constructors');
+  }
+
+  FunctionElement _lookupLocalConstructor(String name) {
+    for (Link<Element> link = constructors;
+         !link.isEmpty;
+         link = link.tail) {
+      if (link.head.name == name) return link.head;
+    }
+    return null;
+  }
+
+  @override
+  Element localLookup(String name) {
+    Element constructor = _lookupLocalConstructor(name);
+    if (constructor != null) return constructor;
+    if (mixin == null) return null;
+    Element mixedInElement = mixin.localLookup(name);
+    if (mixedInElement == null) return null;
+    return mixedInElement.isInstanceMember ? mixedInElement : null;
+  }
+
+  @override
+  void forEachLocalMember(void f(Element member)) {
+    constructors.forEach(f);
+    if (mixin != null) mixin.forEachLocalMember((Element mixedInElement) {
+      if (mixedInElement.isInstanceMember) f(mixedInElement);
+    });
+  }
+}