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-rw-r--r--setuptools/command/build_ext.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/setuptools/command/build_ext.py b/setuptools/command/build_ext.py
index f0913115..e4b2c593 100644
--- a/setuptools/command/build_ext.py
+++ b/setuptools/command/build_ext.py
@@ -208,7 +208,7 @@ class build_ext(_build_ext):
)
# pair each base with the extension
pairs = itertools.product(ns_ext_bases, self.__get_output_extensions())
- return (base + fnext for base, fnext in pairs)
+ return list(base + fnext for base, fnext in pairs)
def __get_output_extensions(self):
yield '.py'