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-rw-r--r--_pytest/mark/legacy.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/_pytest/mark/legacy.py b/_pytest/mark/legacy.py
index 5c7b8d001..30c7239bf 100644
--- a/_pytest/mark/legacy.py
+++ b/_pytest/mark/legacy.py
@@ -17,7 +17,7 @@ class MarkMapping(object):
@classmethod
def from_item(cls, item):
- mark_names = set(mark.name for mark in item.iter_markers())
+ mark_names = {mark.name for mark in item.iter_markers()}
return cls(mark_names)
def __getitem__(self, name):