typeInformation in CreateInstance is a kind of TypeExpression

pkg/compiler/lib/src/cps_ir/cps_ir_tracer.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 dart2js.ir_tracer;
 
 import 'dart:async' show EventSink;
 import 'cps_ir_nodes.dart' as cps_ir;
 import '../tracer.dart';
 
@@ skipping 275 matching lines @@
     return "GetLazyStatic $element";
   }
 
   visitCreateBox(cps_ir.CreateBox node) {
     return 'CreateBox';
   }
 
   visitCreateInstance(cps_ir.CreateInstance node) {
     String className = node.classElement.name;
     String arguments = node.arguments.map(formatReference).join(', ');
-    String typeInformation =
-        node.typeInformation.map(formatReference).join(', ');
+    String typeInformation = formatReference(node.typeInformation);
     return 'CreateInstance $className ($arguments) <$typeInformation>';
   }
 
   visitInterceptor(cps_ir.Interceptor node) {
     return 'Interceptor(${formatReference(node.input)}, '
            '${node.interceptedClasses})';
   }
 
   visitGetMutable(cps_ir.GetMutable node) {
     String variable = names.name(node.variable.definition);
@@ skipping 369 matching lines @@
   }
 
   visitBoundsCheck(cps_ir.BoundsCheck node) {
     unexpectedNode(node);
   }
 
   visitNullCheck(cps_ir.NullCheck node) {
     unexpectedNode(node);
   }
 }