Use closure tracer to identify closures that are not passed to Function.apply

sdk/lib/_internal/compiler/implementation/inferrer/list_tracer.dart

 // Copyright (c) 2013, 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 type_graph_inferrer;
 
 /**
  * A set of selector names that [List] implements, that we know do not
  * change the element type of the list, or let the list escape to code
  * that might change the element type.
@@ skipping 108 matching lines @@
     'sublist',
     'getRange',
     'asMap',
 
     // From JSArray.
     'checkMutable',
     'checkGrowable',
   ]);
 
 
-class ListTracerVisitor extends TracerVisitor {
+class ListTracerVisitor extends TracerVisitor<ListTypeInformation> {
   // The [List] of found assignments to the list.
   List<TypeInformation> assignments = <TypeInformation>[];
   bool callsGrowableMethod = false;
 
   ListTracerVisitor(tracedType, inferrer) : super(tracedType, inferrer);
 
   /**
    * Returns [true] if the analysis completed successfully, [false] if it
    * bailed out. In the former case, [assignments] holds a list of
    * [TypeInformation] nodes that flow into the element type of this list.
@@ skipping 60 matching lines @@
         callsGrowableMethod = true;
         assignments.add(inferrer.types.nullType);
       }
     } else if (selector.isCall() &&
                !info.targets.every((element) => element.isFunction())) {
       bailout('Passed to a closure');
       return;
     }
   }
 }