error[E0015]: cannot match on `str` in constant functions --> $DIR/match-non-const-eq.rs:7:9 | LL | "a" => (), //FIXME [gated]~ ERROR can't compare `str` with `str` in const contexts | ^^^ | = note: `str` cannot be compared in compile-time, and therefore cannot be used in `match`es = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants = help: add `#![feature(const_trait_impl)]` to the crate attributes to enable error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0015`.