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-rw-r--r--mesonbuild/interpreter/type_checking.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/mesonbuild/interpreter/type_checking.py b/mesonbuild/interpreter/type_checking.py
index 7d5665c..d4e178d 100644
--- a/mesonbuild/interpreter/type_checking.py
+++ b/mesonbuild/interpreter/type_checking.py
@@ -11,7 +11,7 @@ from ..interpreterbase.decorators import KwargInfo, ContainerTypeInfo
from ..mesonlib import FileMode, MachineChoice
# Helper definition for type checks that are `Optional[T]`
-NoneType = type(None)
+NoneType: T.Type[None] = type(None)
def in_set_validator(choices: T.Set[str]) -> T.Callable[[str], T.Optional[str]]: