| Index: utils/pub/version_solver.dart
 | 
| diff --git a/utils/pub/version_solver.dart b/utils/pub/version_solver.dart
 | 
| index d4485f9225dd5137d3ab05ea073e6227205cccdd..9a396c2d8a2ea7b79adb003323ba7c149116089f 100644
 | 
| --- a/utils/pub/version_solver.dart
 | 
| +++ b/utils/pub/version_solver.dart
 | 
| @@ -447,7 +447,7 @@ class RemoveConstraint extends ChangeConstraint {
 | 
|      return _processChange(solver, oldDependency, dependency);
 | 
|    }
 | 
|  
 | 
| -  void undo() {
 | 
| +  void undo(VersionSolver solver) {
 | 
|      solver.getDependency(dependent).placeConstraint(depender, _removed);
 | 
|    }
 | 
|  }
 | 
| 
 |