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-rw-r--r--coverage/data.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/coverage/data.py b/coverage/data.py
index 3a2432b3..e6d56d84 100644
--- a/coverage/data.py
+++ b/coverage/data.py
@@ -727,6 +727,8 @@ def combine_parallel_data(data, aliases=None, data_paths=None, strict=False):
files_combined = 0
for f in files_to_combine:
+ if data._debug and data._debug.should('dataio'):
+ data._debug.write("Combining data file %r" % (f,))
try:
new_data = CoverageData(f, debug=data._debug)
new_data.read()