bug#21587: Mac: Segfault when unloading shared object linked to libguile

Hi, I have a rather weird issue with guile on OSX Yosemite (10.10.5). The problem originally stems from weechat [1] which provides guile scripting through a dynamically loaded "plugin" (shared object). However, I was able to extract the problem into a smaller test program. The basic run down

bug#21587: Mac: Segfault when unloading shared object linked to libguile

I forgot to include the link to the original issue: [1]: https://github.com/weechat/weechat/issues/527