Fix mixin resolution order when multiple mixins present.

pkg/analyzer/lib/src/generated/element_resolver.dart

 // Copyright (c) 2014, 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 engine.resolver.element_resolver;
 
 import 'dart:collection';
 
 import 'ast.dart';
 import 'element.dart';
@@ skipping 1688 matching lines @@
         return getter;
       }
     }
     for (InterfaceType interfaceType in targetType.interfaces) {
       PropertyAccessorElement getter =
           _lookUpGetterInInterfaces(interfaceType, true, getterName, visitedInterfaces);
       if (getter != null) {
         return getter;
       }
     }
-    for (InterfaceType mixinType in targetType.mixins) {
+    for (InterfaceType mixinType in targetType.mixins.reversed) {
       PropertyAccessorElement getter =
           _lookUpGetterInInterfaces(mixinType, true, getterName, visitedInterfaces);
       if (getter != null) {
         return getter;
       }
     }
     InterfaceType superclass = targetType.superclass;
     if (superclass == null) {
       return null;
     }
@@ skipping 72 matching lines @@
     for (InterfaceType interfaceType in targetType.interfaces) {
       ExecutableElement member = _lookUpGetterOrMethodInInterfaces(
           interfaceType,
           true,
           memberName,
           visitedInterfaces);
       if (member != null) {
         return member;
       }
     }
-    for (InterfaceType mixinType in targetType.mixins) {
+    for (InterfaceType mixinType in targetType.mixins.reversed) {
       ExecutableElement member = _lookUpGetterOrMethodInInterfaces(
           mixinType,
           true,
           memberName,
           visitedInterfaces);
       if (member != null) {
         return member;
       }
     }
     InterfaceType superclass = targetType.superclass;
@@ skipping 77 matching lines @@
         return method;
       }
     }
     for (InterfaceType interfaceType in targetType.interfaces) {
       MethodElement method =
           _lookUpMethodInInterfaces(interfaceType, true, methodName, visitedInterfaces);
       if (method != null) {
         return method;
       }
     }
-    for (InterfaceType mixinType in targetType.mixins) {
+    for (InterfaceType mixinType in targetType.mixins.reversed) {
       MethodElement method =
           _lookUpMethodInInterfaces(mixinType, true, methodName, visitedInterfaces);
       if (method != null) {
         return method;
       }
     }
     InterfaceType superclass = targetType.superclass;
     if (superclass == null) {
       return null;
     }
@@ skipping 100 matching lines @@
         return setter;
       }
     }
     for (InterfaceType interfaceType in targetType.interfaces) {
       PropertyAccessorElement setter =
           _lookUpSetterInInterfaces(interfaceType, true, setterName, visitedInterfaces);
       if (setter != null) {
         return setter;
       }
     }
-    for (InterfaceType mixinType in targetType.mixins) {
+    for (InterfaceType mixinType in targetType.mixins.reversed) {
       PropertyAccessorElement setter =
           _lookUpSetterInInterfaces(mixinType, true, setterName, visitedInterfaces);
       if (setter != null) {
         return setter;
       }
     }
     InterfaceType superclass = targetType.superclass;
     if (superclass == null) {
       return null;
     }
@@ skipping 1091 matching lines @@
   @override
   Element get staticElement => null;
 
   @override
   accept(AstVisitor visitor) => null;
 
   @override
   void visitChildren(AstVisitor visitor) {
   }
 }