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-rw-r--r--coverage/data.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/coverage/data.py b/coverage/data.py
index ee4f007d..c737d593 100644
--- a/coverage/data.py
+++ b/coverage/data.py
@@ -35,6 +35,7 @@ def line_counts(data: CoverageData, fullpath: bool = False) -> Dict[str, int]:
"""
summ = {}
+ filename_fn: Callable[[str], str]
if fullpath:
# pylint: disable=unnecessary-lambda-assignment
filename_fn = lambda f: f