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-rw-r--r--mesonbuild/environment.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/mesonbuild/environment.py b/mesonbuild/environment.py
index 516966678..da29d6c3c 100644
--- a/mesonbuild/environment.py
+++ b/mesonbuild/environment.py
@@ -702,7 +702,7 @@ class Environment:
# Store a global state of Cargo dependencies
self.cargo: T.Optional[cargo.Interpreter] = None
- def mfilestr2key(self, machine_file_string: str, section_subproject: str, machine: MachineChoice) -> OptionKey:
+ def mfilestr2key(self, machine_file_string: str, section_subproject: T.Optional[str], machine: MachineChoice) -> OptionKey:
key = OptionKey.from_string(machine_file_string)
assert key.machine == MachineChoice.HOST
if key.subproject: