scala/scala — pull request #3527 by Ichoran (2014-02-13 23:43:09+00:00)
Title: SI-8264 scala.collection.immutable.HashSet#- returns broken Set

Was an error in HashSet's handling of removal of an element when a HashTrieSet should turn into a HashSet1.

Also slightly modified HashMap's filter0 to more closely match HashSet (by adding the same comment).