scala/scala — pull request #904 by adriaanm (2012-07-13 18:21:04+00:00)
Title: SI-6077 more conservative TreeMakersToConds for CSE

we were dropping irrefutable extractor calls (implemented for SI-4691)
in common subcondition elimination, which caused bad code to be generated

clean up TreeMakersToConds significantly in the process

review by @paulp and his crack monkeys