| Index: pkg/compiler/lib/src/ssa/ssa_tracer.dart
 | 
| diff --git a/pkg/compiler/lib/src/ssa/ssa_tracer.dart b/pkg/compiler/lib/src/ssa/ssa_tracer.dart
 | 
| index d47e3ad2a8a558e1266569bb2673f67b74839b4b..1768db1c2a114eaed6809fad489d1e72dd0eeac6 100644
 | 
| --- a/pkg/compiler/lib/src/ssa/ssa_tracer.dart
 | 
| +++ b/pkg/compiler/lib/src/ssa/ssa_tracer.dart
 | 
| @@ -145,7 +145,7 @@ class HInstructionStringifier implements HVisitor<String> {
 | 
|        prefix = 'd';
 | 
|      } else if (instruction.isNumber(compiler)) {
 | 
|        prefix = 'n';
 | 
| -    } else if (instruction.instructionType.containsAll(compiler.world)) {
 | 
| +    } else if (instruction.instructionType.containsAll(compiler.closedWorld)) {
 | 
|        prefix = 'v';
 | 
|      } else {
 | 
|        prefix = 'U';
 | 
| 
 |