Even less reliance on Compiler.closedWorld

pkg/compiler/lib/src/ssa/type_builder.dart

 // Copyright (c) 2016, 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.
 
 import 'graph_builder.dart';
 import 'nodes.dart';
 import '../closure.dart';
 import '../common.dart';
 import '../dart_types.dart';
 import '../types/types.dart';
@@ skipping 213 matching lines @@
       HInstruction original, DartType type, int kind) {
     if (type == null) return original;
     // GENERIC_METHODS: The following statement was added for parsing and
     // ignoring method type variables; must be generalized for full support of
     // generic methods.
     type = type.dynamifyMethodTypeVariableType;
     type = type.unaliased;
     assert(assertTypeInContext(type, original));
     if (type.isInterfaceType && !type.treatAsRaw) {
       TypeMask subtype =
-          new TypeMask.subtype(type.element, builder.compiler.closedWorld);
+          new TypeMask.subtype(type.element, builder.closedWorld);
       HInstruction representations =
           buildTypeArgumentRepresentations(type, builder.sourceElement);
       builder.add(representations);
       return new HTypeConversion.withTypeRepresentation(
           type, kind, subtype, original, representations);
     } else if (type.isTypeVariable) {
       TypeMask subtype = original.instructionType;
       HInstruction typeVariable =
           addTypeVariableReference(type, builder.sourceElement);
       return new HTypeConversion.withTypeRepresentation(
           type, kind, subtype, original, typeVariable);
     } else if (type.isFunctionType) {
       return builder.buildFunctionTypeConversion(original, type, kind);
     } else {
       return original.convertType(builder.closedWorld, type, kind);
     }
   }
 }