tree 0c42776db89af408bdc247b6a52583e99a72252b
parent 46ab6dfa89e2d5eeed8f85b40c022161e2493800
author Guido van Rossum <guido@python.org> 933709270 +0000
committer Guido van Rossum <guido@python.org> 933709270 +0000
HG:extra convert_revision:svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/python/branches/legacy-trunk%4013701

It turns out that modifying the environment strings is not safe.
Treat them as read-only, and make a copy as appropriately.  This was
first reported by Bill Janssend and later by Craig Rowland and Ron
Sedlmeyer.  This fix is mine.