rust/src/test/ui/or-patterns/inconsistent-modes.rs

// This test ensures that or patterns require binding mode consistency across arms.

#![feature(or_patterns)]
#![allow(non_camel_case_types)]
fn main() {
    // One level:
    let Ok(a) | Err(ref a): Result<&u8, u8> = Ok(&0);
    //~^ ERROR variable `a` is bound inconsistently
    let Ok(ref mut a) | Err(a): Result<u8, &mut u8> = Ok(0);
    //~^ ERROR variable `a` is bound inconsistently
    let Ok(ref a) | Err(ref mut a): Result<&u8, &mut u8> = Ok(&0);
    //~^ ERROR variable `a` is bound inconsistently
    //~| ERROR mismatched types
    let Ok((ref a, b)) | Err((ref mut a, ref b)) = Ok((0, &0));
    //~^ ERROR variable `a` is bound inconsistently
    //~| ERROR variable `b` is bound inconsistently
    //~| ERROR mismatched types

    // Two levels:
    let Ok(Ok(a) | Err(a)) | Err(ref a) = Err(0);
    //~^ ERROR variable `a` is bound inconsistently

    // Three levels:
    let Ok([Ok((Ok(ref a) | Err(a),)) | Err(a)]) | Err(a) = Err(&1);
    //~^ ERROR variable `a` is bound inconsistently
}