Take is checks into account when deriving interceptor classes.

sdk/lib/_internal/compiler/implementation/ssa/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.
 
 library tracer;
 
 import 'dart:async' show EventSink;
 
 import 'ssa.dart';
 import '../js_backend/js_backend.dart';
@@ skipping 311 matching lines @@
 
   String visitIndexAssign(HIndexAssign node) {
     String receiver = temporaryId(node.receiver);
     String index = temporaryId(node.index);
     String value = temporaryId(node.value);
     return "IndexAssign: $receiver[$index] = $value";
   }
 
   String visitInterceptor(HInterceptor node) {
     String value = temporaryId(node.inputs[0]);
+    if (node.interceptedClasses != null) {
+      JavaScriptBackend backend = compiler.backend;
+      String cls = backend.namer.getInterceptorSuffix(node.interceptedClasses);
+      return "Intercept ($cls): $value";
+    }
     return "Intercept: $value";
   }
 
   String visitInvokeClosure(HInvokeClosure node)
       => visitInvokeDynamic(node, "closure");
 
   String visitInvokeDynamic(HInvokeDynamic invoke, String kind) {
     String receiver = temporaryId(invoke.receiver);
     String name = invoke.selector.name;
     String target = "($kind) $receiver.$name";
@@ skipping 197 matching lines @@
   }
 
   String visitInterfaceType(HInterfaceType node) {
     return "InterfaceType: ${node.dartType}";
   }
 
   String visitDynamicType(HDynamicType node) {
     return "DynamicType";
   }
 }