From a1dd15f6018c2ccdf065880104faa4068b306285 Mon Sep 17 00:00:00 2001
From: knutnergaard <knut.nergaard@gmail.com>
Date: Tue, 25 Feb 2025 21:49:24 +0100
Subject: [PATCH] Fix `mypy` errors.

---
 Lib/fontParts/base/features.py | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/Lib/fontParts/base/features.py b/Lib/fontParts/base/features.py
index d52f82aa..b11db571 100644
--- a/Lib/fontParts/base/features.py
+++ b/Lib/fontParts/base/features.py
@@ -1,5 +1,5 @@
 from __future__ import annotations
-from typing import TYPE_CHECKING, Tuple, List, Optional
+from typing import TYPE_CHECKING, Callable, Tuple, List, Optional, Union
 
 from fontParts.base.base import BaseObject, dynamicProperty, reference
 from fontParts.base import normalizers
@@ -32,7 +32,7 @@ def _reprContents(self) -> List[str]:
 
     # Font
 
-    _font: Optional[BaseFont] = None
+    _font: Optional[Callable[[], BaseFont]] = None
 
     font: dynamicProperty = dynamicProperty(
         "font",
@@ -58,7 +58,9 @@ def _get_font(self) -> Optional[BaseFont]:
             return None
         return self._font()
 
-    def _set_font(self, font: Optional[BaseFont]) -> None:
+    def _set_font(
+        self, font: Optional[Union[BaseFont, Callable[[], BaseFont]]]
+    ) -> None:
         if self._font is not None and self._font() != font:
             raise AssertionError(
                 "font for features already set and is not same as font"