https://issues.dlang.org/show_bug.cgi?id=16048 --- Comment #5 from github-bugzilla at puremagic.com --- Commit pushed to newCTFE at https://github.com/dlang/phobos https://github.com/dlang/phobos/commit/43880932f56f412eb5c3e4fcc395c507c1aa93ad Throw error on duplicate long/short options --