Clean-up of getCompilationUnit.

lib/compiler/implementation/typechecker.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.
 
 class TypeCheckerTask extends CompilerTask {
   TypeCheckerTask(Compiler compiler) : super(compiler);
   String get name() => "Type checker";
 
   static final bool LOG_FAILURES = false;
 
@@ skipping 115 matching lines @@
 
 class Types {
   final VoidType voidType;
   final InterfaceType dynamicType;
 
   Types(Element dynamicElement)
     : this.with(dynamicElement, new LibraryElement(new Script(null, null)));
 
   // TODO(karlklose): should we have a class Void?
   Types.with(Element dynamicElement, LibraryElement library)
-    : voidType = new VoidType(new VoidElement(library)),
+    : voidType = new VoidType(new VoidElement(library.entryCompilationUnit)),
       dynamicType = new InterfaceType(dynamicElement);
 
   /** Returns true if t is a subtype of s */
   bool isSubtype(Type t, Type s) {
     if (t === s || t === dynamicType || s === dynamicType ||
         // TODO(karlklose): Test for s.element === compiler.objectClass.
         s.name == const SourceString('Object')) return true;
     if (t is VoidType) {
       return false;
     } else if (t is InterfaceType) {
@@ skipping 634 matching lines @@
   }
 
   visitCatchBlock(CatchBlock node) {
     return unhandledStatement();
   }
 
   visitTypedef(Typedef node) {
     return unhandledStatement();
   }
 }