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#![feature(let_else)]
#![allow(unused_variables)]
fn ref_() {
let bytes: Vec<u8> = b"Hello"[..].to_vec();
let some = Some(bytes);
let Some(ref a) = Some(()) else { return };
// | ref | type annotation | & |
// | --- | --------------- | - |
// | x | | | OK
// | x | | x | OK
// | | | x | OK
// | x | x | |
let Some(ref a): Option<&[u8]> = some else { return }; //~ ERROR mismatched types
let b: & [u8] = a;
// | x | x | x |
let Some(ref a): Option<&[u8]> = &some else { return }; //~ ERROR mismatched types
let b: & [u8] = a;
// | | x | |
let Some(a): Option<&[u8]> = some else { return }; //~ ERROR mismatched types
let b: &[u8] = a;
// | | x | x |
let Some(a): Option<&[u8]> = &some else { return }; //~ ERROR mismatched types
let b: &[u8] = a;
}
fn ref_mut() {
// This `ref mut` case had an ICE, see issue #89960
let Some(ref mut a) = Some(()) else { return };
let bytes: Vec<u8> = b"Hello"[..].to_vec();
let mut some = Some(bytes);
// | ref mut | type annotation | &mut |
// | ------- | --------------- | ---- |
// | x | | | OK
// | x | | x | OK
// | | | x | OK
// | x | x | |
let Some(ref mut a): Option<&mut [u8]> = some else { return }; //~ ERROR mismatched types
let b: &mut [u8] = a;
// | x | x | x | (nope)
let Some(ref mut a): Option<&mut [u8]> = &mut some else { return }; //~ ERROR mismatched types
let b: &mut [u8] = a;
// | | x | |
let Some(a): Option<&mut [u8]> = some else { return }; //~ ERROR mismatched types
let b: &mut [u8] = a;
// | | x | x |
let Some(a): Option<&mut [u8]> = &mut some else { return }; //~ ERROR mismatched types
let b: &mut [u8] = a;
}
fn main() {
ref_();
ref_mut();
}
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