…not keep reference to returned object (pythonGH-1560) * bpo-27144: concurrent.futures as_complie and map iterators do not keep reference to returned object * Some nits. Improve wordings in docstrings and comments, and avoid relying on sys.getrefcount() in tests. (cherry picked from commit 97e1b1c)
bpo-27144: concurrent.futures as_complie and map iterators do not keep
reference to returned object
(cherry picked from commit 97e1b1c)
https://bugs.python.org/issue27144