error[E0379]: functions in traits cannot be declared const --> $DIR/feature-gate-min_const_fn.rs:6:5 | LL | const fn foo() -> u32; | ^^^^^ functions in traits cannot be const error[E0379]: functions in traits cannot be declared const --> $DIR/feature-gate-min_const_fn.rs:7:5 | LL | const fn bar() -> u32 { 0 } | ^^^^^ functions in traits cannot be const error[E0379]: functions in traits cannot be declared const --> $DIR/feature-gate-min_const_fn.rs:11:5 | LL | const fn foo() -> u32 { 0 } | ^^^^^ functions in traits cannot be const error: aborting due to 3 previous errors For more information about this error, try `rustc --explain E0379`.