This might not be a super idea, but It would be really cool and useful in some cases to be able to expose LLVM types like i1, i128, fp128, vectors <16 x i8> etc. to rust, mainly to interface with LLVM intrinsics that take these types as parameters, but also to implement SIMD in Rust.

I don't know how this would be implemented, but it doesn't really matter if it is ugly since only library code would ever need it (probably.)