Looks like creating #guix package for big project it's easy way to find some spots that must be fixed.
While I worked on #rust package for guix I already committed two fixes to rust compiler and opened two issues for separate packages used by rust compiler.
While I worked on package for #poky https://github.com/mnd/guix-mnd-pkgs/blob/master/mnd/packages/yocto.scm I made 4 fixes for #openembedded code.
That feeling when only code that you write in #rust is patches to rust compiler itself.
Fixed #rust build for #guixsd with glibc 2.27 and created package for rust 1.26.2 release. Waiting for approve https://debbugs.gnu.org/cgi/bugreport.cgi?bug=31955
I'm going to migrate from my mnd@io.mndet.net #pumpio account to this place.