Speaking as someone who has spent time optimizing programs in both languages, Rust is certainly not in the same tier as Haskell. It should be in the same tier a

Speaking as someone who has spent time optimizing programs in both languages, Rust is certainly not in the same tier as Haskell. It should be in the same tier as C or C++. If there's a program where it's not, then we consider it a bug. (And indeed, those exist. :-) But they are fixable!)