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-rw-r--r--coverage/results.py5
1 files changed, 2 insertions, 3 deletions
diff --git a/coverage/results.py b/coverage/results.py
index bfd9e52e..e6475afb 100644
--- a/coverage/results.py
+++ b/coverage/results.py
@@ -1,5 +1,6 @@
"""Results of coverage measurement."""
+import collections
import os
from coverage.backward import iitems
@@ -158,11 +159,9 @@ class Analysis(object):
"""
missing = self.arcs_missing()
branch_lines = set(self.branch_lines())
- mba = {}
+ mba = collections.defaultdict(list)
for l1, l2 in missing:
if l1 in branch_lines:
- if l1 not in mba:
- mba[l1] = []
mba[l1].append(l2)
return mba