Issue 10004 - tuple comparison with side-effect should work

http://d.puremagic.com/issues/show_bug.cgi?id=10004

This is a poor bug of 2.063 new feature (== [issue 9873](http://d.puremagic.com/issues/show_bug.cgi?id=9873)), so I want to fix this before 2.063 release.