Results in unmaintainable code for large projects. All the fancy features sound nice, but the moment you try something large and non trivial all sorts of hacks

Results in unmaintainable code for large projects. All the fancy features sound nice, but the moment you try something large and non trivial all sorts of hacks seep into your codebase. The solution is the same as in C++, write straightforward code and avoid terseness. But if you are at that level already you could just use C++ for a much more mature toolchain (blows away rust when it comes to compiler optimizations even when both use an LLVM backend).