https://issues.dlang.org/show_bug.cgi?id=15060
--- Comment #1 from ponce <alil...@gmail.com> --- Suggestion from David Nadlinger " This is OS X only, right? In this case, it is hard to judge where exactly it sits and what needs to be done to fix it, as no work has been done on dylib support recently in either compiler. A wild guess is that there might still be an image change handler, etc. registered that dyld tries to call when loading the new library, but which no longer exists in the program. Searching druntime for "_dyld" might reveal something of this sort." --