https://issues.dlang.org/show_bug.cgi?id=18948
--- Comment #1 from github-bugzi...@puremagic.com --- Commits pushed to master at https://github.com/dlang/phobos https://github.com/dlang/phobos/commit/fa5830c32ee08c34bdfc10bfb62dd7cb5ee87ba3 Fix Issue 18948 - toLower and toUpper should work with random access ranges https://github.com/dlang/phobos/commit/cc58e8a7bf3dec7004cdd9511df927ba38cdeb3c Merge pull request #6545 from JackStouffer/toCase-random-access Issue 18948 - std.uni.toLower and std.uni.toUpper should work with random access ranges merged-on-behalf-of: Jack Stouffer <j...@jackstouffer.com> --