Update promotion.py

beartype · May 14, 2024 · 2e7a4e0 · 2e7a4e0
1 parent 37f473b
commit 2e7a4e0
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/plum/promotion.py b/plum/promotion.py
@@ -58,7 +58,7 @@ def __call__(self, obj: T) -> R:
 
 
 def add_conversion_method(
-    type_from: Type[T], type_to: Type[R], f: _ConversionCallable
+    type_from: Type[T], type_to: Type[R], f: _ConversionCallable[T, R],
 ) -> None:
     """Add a conversion method to convert an object from one type to another.