error[E0005]: refutable pattern in function argument: `(_, _)` not covered --> $DIR/refutable-pattern-errors.rs:1:9 | LL | fn func((1, (Some(1), 2..=3)): (isize, (Option, isize))) { } | ^^^^^^^^^^^^^^^^^^^^^ pattern `(_, _)` not covered error[E0005]: refutable pattern in local binding: `(-2147483648i32..=0i32, _)` not covered --> $DIR/refutable-pattern-errors.rs:5:9 | LL | let (1, (Some(1), 2..=3)) = (1, (None, 2)); | ^^^^^^^^^^^^^^^^^^^^^ pattern `(-2147483648i32..=0i32, _)` not covered error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0005`.