error[E0308]: mismatched types --> $DIR/generic-param-mismatch.rs:2:5 | LL | fn test() -> [u8; M] { | ------- expected `[u8; M]` because of return type LL | [0; N] | ^^^^^^ expected `M`, found `N` | = note: expected array `[u8; M]` found array `[u8; N]` error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0308`.