error[E0005]: refutable pattern in local binding: `i32::MIN..=-1_i32` and `1_i32..=i32::MAX` not covered --> $DIR/const-match-check.rs:31:24 | LL | let x: [i32; { let 0 = 0; 0 }] = []; | ^ patterns `i32::MIN..=-1_i32` and `1_i32..=i32::MAX` not covered | = 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` help: you might want to use `if let` to ignore the variants that aren't matched | LL | let x: [i32; { if let 0 = 0 { todo!() } 0 }] = []; | ++ ~~~~~~~~~~~ error: aborting due to previous error For more information about this error, try `rustc --explain E0005`.