imageworks/OpenShadingLanguage — pull request #82 by lgritz (2011-10-19 19:06:52+00:00)
Title: Bug fix -- the optimization of "a=b; a=c" is botched

Bug fix -- the optimization of "a=b; a=c" to eliminate the first assignment
will fail if it's really "a=b; a=a". Watch out for that!