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-rw-r--r--SCons/Tool/m4.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/SCons/Tool/m4.py b/SCons/Tool/m4.py
index 8506784de..341d93dfa 100644
--- a/SCons/Tool/m4.py
+++ b/SCons/Tool/m4.py
@@ -37,7 +37,7 @@ import SCons.Action
import SCons.Builder
import SCons.Util
-def generate(env):
+def generate(env) -> None:
"""Add Builders and construction variables for m4 to an Environment."""
M4Action = SCons.Action.Action('$M4COM', '$M4COMSTR')
bld = SCons.Builder.Builder(action = M4Action, src_suffix = '.m4')