This document tracks things that we know the translator can't handle, as well as things it probably won't ever handle.

• variadic function definitions (blocking Rust issue)
• preserving comments (work in progress)
• long double and _Complex types (partially blocked by Rust language)
• Non x86/64 SIMD function/types and x86/64 SIMD function/types which have no rust equivalent

• GNU packed structs (Rust has #[repr(packed)] compatible with #[repr(C)])
• inline functions (Rust has #[inline])
• restrict pointers (Rust has references)
• inline assembly
• macros

• longjmp/setjmp Although there are LLVM intrinsics for these, it is unclear how these interact with Rust (esp. idiomatic Rust).
• jumps into and out of statement expressions We support GNU C statement expressions, but we can not handle jumping into or out of these. Both entry and exit into the expression have to be through the usual fall-through evaluation of the expression.