tree d9afe6c3cad9bd6b961435d6ea1e1572f8001b8c
parent dbecd93b7203cd187c1978de1207c29d3a9a686c
author Raymond Hettinger <python@rcn.com> 1107727542 +0000
committer Raymond Hettinger <python@rcn.com> 1107727542 +0000
HG:extra convert_revision:svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/python/branches/legacy-trunk%4038427

Transform "x in (1,2,3)" to "x in frozenset([1,2,3])".

Inspired by Skip's idea to recognize the throw-away nature of sequences
in this context and to transform their type to one with better performance.