Hi all,
  There is the opportunity to add D demangling to LLVM, as you can see from this PR: https://reviews.llvm.org/rG7310403e3cdf
(the PR adds Rust demangling, clearly showing how D demangling could be added)

I think it will be a fun project to work on if you are interested in contributing to LLVM.
Impact estimate: D demangling capability in llvm-cxxfilt, libLLVM, and probably in the future also lldb.

cheers,
  Johan