Compiler build error

[kinke]

You're most likely hitting an ICE in the front-end (as both 
compilers crash). What you can always do is invoke the compiler 
in a GDB session. That's especially useful with an LDC CI build 
(download: 
https://github.com/ldc-developers/ldc/releases/tag/CI), as it 
features debuginfos and enabled LLVM/LDC assertions.

Please file an issue once you narrowed it down a little, ideally 
with a small reproducible test case.