Use warn_unreachable as well

Author: sobolevn

Lib/tomllib/_parser.py

@@ -273,7 +273,7 @@ def get_or_create_nest(
         *,
         access_lists: bool = True,
     ) -> dict[str, Any]:
-        cont = self.dict
+        cont: Any = self.dict
         for k in key:
             if k not in cont:
                 cont[k] = {}
@@ -282,7 +282,7 @@ def get_or_create_nest(
                 cont = cont[-1]
             if not isinstance(cont, dict):
                 raise KeyError("There is no nest behind this key")
-        return cont
+        return cont  # type: ignore[no-any-return]
 
     def append_nest_to_list(self, key: Key) -> None:
         cont = self.get_or_create_nest(key[:-1])

Lib/tomllib/mypy.ini

@@ -14,3 +14,4 @@ enable_error_code = ignore-without-code
 strict = True
 strict_bytes = True
 local_partial_types = True
+warn_unreachable = True