Fix issue 8848: access to type variable inside a closure declared in a field initializer must use t…

sdk/lib/_internal/compiler/implementation/ssa/builder.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.
 
 part of ssa;
 
 /**
  * A special element for the extra parameter taken by intercepted
  * methods. We need to override [Element.computeType] because our
  * optimizers may look at its declared type.
@@ skipping 3137 matching lines @@
   /**
    * Helper to create an instruction that gets the value of a type variable.
    */
   HInstruction addTypeVariableReference(TypeVariableType type) {
     Element member = currentElement;
     if (member.enclosingElement.isClosure()) {
       ClosureClassElement closureClass = member.enclosingElement;
       member = closureClass.methodElement;
       member = member.getOutermostEnclosingMemberOrTopLevel();
     }
-    if (member.isConstructor() || member.isGenerativeConstructorBody()) {
+    if (member.isConstructor()
+        || member.isGenerativeConstructorBody()
+        || member.isField()) {
       // The type variable is stored in a parameter of the method.
       return localsHandler.readLocal(type.element);
     } else if (member.isInstanceMember()) {
       // The type variable is stored on the object.  Generate code to extract
       // the type arguments from the object, substitute them as an instance
       // of the type we are testing against (if necessary), and extract the
       // type argument by the index of the variable in the list of type
       // variables for that class.
       int index = RuntimeTypeInformation.getTypeVariableIndex(type);
       HInstruction thisObject = localsHandler.readThis();
@@ skipping 1913 matching lines @@
           new HSubGraphBlockInformation(elseBranch.graph));
 
     HBasicBlock conditionStartBlock = conditionBranch.block;
     conditionStartBlock.setBlockFlow(info, joinBlock);
     SubGraph conditionGraph = conditionBranch.graph;
     HIf branch = conditionGraph.end.last;
     assert(branch is HIf);
     branch.blockInformation = conditionStartBlock.blockFlow;
   }
 }