| Index: lib/compiler/implementation/tree/nodes.dart | 
| =================================================================== | 
| --- lib/compiler/implementation/tree/nodes.dart	(revision 11792) | 
| +++ lib/compiler/implementation/tree/nodes.dart	(working copy) | 
| @@ -282,6 +282,8 @@ | 
| isOperator && selector.asOperator().source.stringValue === '&&'; | 
| bool get isLogicalOr => | 
| isOperator && selector.asOperator().source.stringValue === '||'; | 
| +  bool get isParameterCheck => | 
| +      isOperator && selector.asOperator().source.stringValue === '?'; | 
|  | 
| Token getBeginToken() { | 
| if (isPrefix && !isIndex) return selector.getBeginToken(); | 
|  |