Don't allow statement-nodes in expression contexts.

lib/compiler/implementation/ssa/tracer.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.
 
 #library('tracer');
 
 #import('dart:io');
 #import('ssa.dart');
 #import('../leg.dart');
 
@@ skipping 225 matching lines @@
     return "Continue: (B${target.id})";
   }
 
   String visitDivide(HDivide node) => visitInvokeStatic(node);
 
   String visitEquals(HEquals node) => visitInvokeStatic(node);
 
   String visitExit(HExit node) => "exit";
 
   String visitFieldGet(HFieldGet node) {
-    return 'get ${temporaryId(node.receiver)}';
+    String fieldName = node.element.name.slowToString();
+    return 'get ${temporaryId(node.receiver)}.$fieldName';
   }
 
   String visitFieldSet(HFieldSet node) {
     String valueId = temporaryId(node.value);
-    return 'set ${temporaryId(node.receiver)} to $valueId';
+    String fieldName = node.element.name.slowToString();
+    return 'set ${temporaryId(node.receiver)}.$fieldName to $valueId';
   }
 
   String visitLocalGet(HLocalGet node) => visitFieldGet(node);
   String visitLocalSet(HLocalSet node) => visitFieldSet(node);
 
   String visitGoto(HGoto node) {
     HBasicBlock target = currentBlock.successors[0];
     return "Goto: (B${target.id})";
   }
 
@@ skipping 209 matching lines @@
     } else {
       throw new CompilerCancelledException('Unexpected type guard: $type');
     }
     StringBuffer envBuffer = new StringBuffer();
     List<HInstruction> inputs = node.inputs;
     for (int i = 0; i < inputs.length; i++) {
       if (inputs[i] !== node.guarded) {
         envBuffer.add(" ${temporaryId(inputs[i])}");
       }
     }
-    String on = node.isOn ? "on" : "off";
+    String on = node.isEnabled ? "enabled" : "disabled";
     String id = temporaryId(node.guarded);
     return "TypeGuard($on): $id is $type env: $envBuffer";
   }
 
   String visitIs(HIs node) {
     String type = node.typeExpression.toString();
     return "TypeTest: ${temporaryId(node.expression)} is $type";
   }
 
   String visitTypeConversion(HTypeConversion node) {
     String type = node.propagatedType.toString();
     return "TypeConversion: ${temporaryId(node.inputs[0])} to $type";
   }
 }