fix: set hugr field of PassResult correctly (#2715)

CalMacCQ · acl-cqc · commit 4abedabfd901 · 2025-11-26T15:18:44.000Z
diff --git a/hugr-py/src/hugr/passes/_composable_pass.py b/hugr-py/src/hugr/passes/_composable_pass.py
@@ -32,6 +32,7 @@ def run(self, hugr: Hugr, *, inplace: bool = True) -> PassResult:
 
         See :func:`implement_pass_run` for a helper function to implement this method.
         """
+        ...
 
     @property
     def name(self) -> PassName:
@@ -69,10 +70,10 @@ def implement_pass_run(
             return inplace_call(hugr)
         elif copy_call is not None:
             pass_result = copy_call(hugr)
-            pass_result.hugr = hugr
             if pass_result.modified:
                 hugr._overwrite_hugr(pass_result.hugr)
                 pass_result.inplace = True
+            pass_result.hugr = hugr
             return pass_result
     elif not inplace:
         if copy_call is not None:
