D-Programming-Language/phobos — pull request #1837 by blackwhale (2014-01-06 11:11:03+00:00)
Title: Fix issue 11808 std.uni.CodepointSet('А', 'Я'+1, 'а', 'я'+1) asserts 

Instead of putting the burden on user to verify the order of intervals it makes sense to stably sort and merge as needed instead.