error[E0379]: functions in traits cannot be declared const --> $DIR/const-fn-not-in-trait.rs:5:5 | LL | const fn f() -> u32; | ^^^^^ functions in traits cannot be const error[E0379]: functions in traits cannot be declared const --> $DIR/const-fn-not-in-trait.rs:7:5 | LL | const fn g() -> u32 { | ^^^^^ functions in traits cannot be const error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0379`.