[Issue 18938] Dmd segfault when compiling this dub package in test release

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18938

--- Comment #1 from Roman <freeslave93 at gmail.com> ---
Created attachment 1700
  --> https://issues.dlang.org/attachment.cgi?id=1700&action=edit
Dustmite result

I added the reduced result produced by dustmite that can be run without dub:
dmd -c icontheme-test-library.o -release -inline -Isource/ -main
source/icontheme/cache.d source/icontheme/file.d source/icontheme/lookup.d
source/icontheme/package.d

--