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-rw-r--r--coverage/collector.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/coverage/collector.py b/coverage/collector.py
index 29dddf6b..1837aae2 100644
--- a/coverage/collector.py
+++ b/coverage/collector.py
@@ -251,7 +251,7 @@ class Collector(object):
line_data = {}
for f, arcs in self.data.items():
line_data[f] = ldf = {}
- for l1, _ in arcs:
+ for l1, _ in list(arcs.keys()):
if l1:
ldf[l1] = None
return line_data