dart2js cps: Handle error cases.

pkg/compiler/lib/src/tree_ir/tree_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 tree_ir_tracer;
 
 import 'dart:async' show EventSink;
 import '../tracer.dart';
 import 'tree_ir_nodes.dart';
 
@@ skipping 342 matching lines @@
     return names.varName(node.variable);
   }
 
   String visitAssign(Assign node) {
     String variable = names.varName(node.variable);
     String value = visitExpression(node.value);
     return '$variable = $value';
   }
 
   String formatArguments(Invoke node) {
-    List<String> args = new List<String>();
-    int positionalArgumentCount = node.selector.positionalArgumentCount;
-    for (int i = 0; i < positionalArgumentCount; ++i) {
-      args.add(node.arguments[i].accept(this));
-    }
-    for (int i = 0; i < node.selector.namedArgumentCount; ++i) {
-      String name = node.selector.namedArguments[i];
-      String arg = node.arguments[positionalArgumentCount + i].accept(this);
-      args.add("$name: $arg");
-    }
-    return args.join(', ');
+    return node.arguments.map(visitExpression).join(', ');
   }
 
   String visitInvokeStatic(InvokeStatic node) {
     String head = node.target.name;
     String args = formatArguments(node);
     return "$head($args)";
   }
 
   String visitInvokeMethod(InvokeMethod node) {
     String receiver = node.receiver.accept(this);
@@ skipping 144 matching lines @@
 
   @override
   String visitReifyRuntimeType(ReifyRuntimeType node) {
     return 'Reify ${node.value}';
   }
 
   @override
   String visitTypeExpression(TypeExpression node) {
     return node.dartType.toString();
   }
+
+  @override
+  String visitCreateInvocationMirror(CreateInvocationMirror node) {
+    String args = node.arguments.map(visitExpression).join(', ');
+    return 'CreateInvocationMirror(${node.selector.name}, $args)';
+  }
 }
 
 /**
  * Invents (and remembers) names for Variables that do not have an associated
  * identifier.
  *
  * In case a variable is named v0, v1, etc, it may be assigned a different
  * name to avoid clashing with a previously synthesized variable name.
  */
 class Names {
   final Map<Variable, String> _names = {};
   final Set<String> _usedNames = new Set();
   int _counter = 0;
 
   String varName(Variable v) {
     String name = _names[v];
     if (name == null) {
       String prefix = v.element == null ? 'v' : '${v.element.name}_';
       while (name == null || _usedNames.contains(name)) {
         name = "$prefix${_counter++}";
       }
       _names[v] = name;
       _usedNames.add(name);
     }
     return name;
   }
 }