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-rw-r--r--coverage/types.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/coverage/types.py b/coverage/types.py
index 23c7ef8b..ee5ae010 100644
--- a/coverage/types.py
+++ b/coverage/types.py
@@ -44,4 +44,7 @@ class TConfigurable(Protocol):
"""
-TArc = Tuple[int, int]
+# Line numbers are pervasive enough that they deserve their own type.
+TLineNo = int
+
+TArc = Tuple[TLineNo, TLineNo]