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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 9333d66a..a4f1790d 100644
--- a/coverage/collector.py
+++ b/coverage/collector.py
@@ -55,7 +55,7 @@ class Collector(object):
_collectors = []
# The concurrency settings we support here.
- SUPPORTED_CONCURRENCIES = set(["greenlet", "eventlet", "gevent", "thread"])
+ SUPPORTED_CONCURRENCIES = {"greenlet", "eventlet", "gevent", "thread"}
def __init__(
self, should_trace, check_include, should_start_context, file_mapper,