tests/ui/pattern/deref-patterns/needs-gate.rs

// gate-test-deref_patterns

fn main() {
    match Box::new(0) {
        deref!(0) => {}
        //~^ ERROR: use of unstable library feature `deref_patterns`: placeholder syntax for deref patterns
        _ => {}
    }

    match Box::new(0) {
        0 => {}
        //~^ ERROR: mismatched types
        _ => {}
    }

    // `deref_patterns` allows string and byte string literals to have non-ref types.
    match *"test" {
        "test" => {}
        //~^ ERROR: mismatched types
        _ => {}
    }
    match *b"test" {
        b"test" => {}
        //~^ ERROR: mismatched types
        _ => {}
    }
    match *(b"test" as &[u8]) {
        b"test" => {}
        //~^ ERROR: mismatched types
        _ => {}
    }

    // `deref_patterns` allows string and byte string patterns to implicitly peel references.
    match &"str" {
        "str" => {}
        //~^ ERROR: mismatched types
        _ => {}
    }
    match &b"str" {
        b"str" => {}
        //~^ ERROR: mismatched types
        _ => {}
    }
    match "str".to_owned() {
        "str" => {}
        //~^ ERROR: mismatched types
        _ => {}
    }

    // `deref_patterns` allows string and byte string patterns to match on mutable references.
    // See also `tests/ui/pattern/byte-string-mutability-mismatch.rs`.
    if let "str" = &mut *"str".to_string() {}
    //~^ ERROR mismatched types
    if let b"str" = &mut b"str".clone() {}
    //~^ ERROR mismatched types
    if let b"str" = &mut b"str".clone()[..] {}
    //~^ ERROR mismatched types
}