D-Programming-Language/dmd — pull request #3206 by yebblies (2014-02-04 11:50:28+00:00)
Title: Issue 11939 - selective imports inside a scope(failure) block cause compiler segfault

Statements may have semantic run multiple times, so do not re-add the aliasdecls if they already exist.

https://d.puremagic.com/issues/show_bug.cgi?id=11939