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-rw-r--r--coverage/html.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/coverage/html.py b/coverage/html.py
index 247d2ae1..ef50b56b 100644
--- a/coverage/html.py
+++ b/coverage/html.py
@@ -84,7 +84,7 @@ class HtmlDataGeneration(object):
data = self.coverage.get_data()
self.has_arcs = data.has_arcs()
if self.config.show_contexts:
- if data.measured_contexts() == set([""]):
+ if data.measured_contexts() == {""}:
self.coverage._warn("No contexts were measured")
data.set_query_contexts(self.config.report_contexts)