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-rw-r--r--SCons/Tool/lex.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/SCons/Tool/lex.py b/SCons/Tool/lex.py
index 3f1a3ade1..527f91c29 100644
--- a/SCons/Tool/lex.py
+++ b/SCons/Tool/lex.py
@@ -95,7 +95,7 @@ def lexEmitter(target, source, env) -> tuple:
return target, source
-def get_lex_path(env, append_paths=False) -> Optional[str]:
+def get_lex_path(env, append_paths: bool=False) -> Optional[str]:
"""
Returns the path to the lex tool, searching several possible names.