https://issues.dlang.org/show_bug.cgi?id=17116
--- Comment #2 from github-bugzi...@puremagic.com --- Commits pushed to master at https://github.com/dlang/phobos https://github.com/dlang/phobos/commit/181db425c9f19b0fa20f0c2c6cd9287922a640ae fix issue 17116 - std.typecons.ReplaceType is not able to process const delegate https://github.com/dlang/phobos/commit/78be8eef4a597b9bd0e241402b32344601fb6570 Merge pull request #5060 from BBasile/issue-17116 fix issue 17116 - std.typecons.ReplaceType is not able to process const delegates --