error[E0005]: refutable pattern in local binding --> $DIR/const-pat-non-exaustive-let-new-var.rs:2:9 | LL | let A = 3; | ^ | | | patterns `i32::MIN..=1_i32` and `3_i32..=i32::MAX` not covered | missing patterns are not covered because `A` is interpreted as a constant pattern, not a new variable | help: introduce a variable instead: `A_var` | = note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant = note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html = note: the matched value is of type `i32` error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0005`.