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-rw-r--r--coverage/sqldata.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/coverage/sqldata.py b/coverage/sqldata.py
index 2bec3c96..b3157a8a 100644
--- a/coverage/sqldata.py
+++ b/coverage/sqldata.py
@@ -516,8 +516,12 @@ class CoverageData(SimpleReprMixin):
assert lines or arcs
assert not (lines and arcs)
if lines and self._has_arcs:
+ if self._debug.should("dataop"):
+ self._debug.write("Error: Can't add line measurements to existing branch data")
raise DataError("Can't add line measurements to existing branch data")
if arcs and self._has_lines:
+ if self._debug.should("dataop"):
+ self._debug.write("Error: Can't add branch measurements to existing line data")
raise DataError("Can't add branch measurements to existing line data")
if not self._has_arcs and not self._has_lines:
self._has_lines = lines