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|
// Test that or-patterns are pass-through with respect to default binding modes.
// check-pass
#![allow(irrefutable_let_patterns)]
#![allow(drop_copy)]
#![allow(drop_ref)]
fn main() {
// A regression test for a mistake we made at one point:
match &1 {
e @ &(1..=2) | e @ &(3..=4) => {}
_ => {}
}
match &0 {
0 | &1 => {}
_ => {}
}
type R<'a> = &'a Result<u8, u8>;
let res: R<'_> = &Ok(0);
match res {
// Alternatives propagate expected type / binding mode independently.
Ok(mut x) | &Err(mut x) => drop::<u8>(x),
}
match res {
&(Ok(x) | Err(x)) => drop::<u8>(x),
}
match res {
Ok(x) | Err(x) => drop::<&u8>(x),
}
if let Ok(mut x) | &Err(mut x) = res {
drop::<u8>(x);
}
if let &(Ok(x) | Err(x)) = res {
drop::<u8>(x);
}
let (Ok(mut x) | &Err(mut x)) = res;
drop::<u8>(x);
let &(Ok(x) | Err(x)) = res;
drop::<u8>(x);
let (Ok(x) | Err(x)) = res;
drop::<&u8>(x);
for Ok(mut x) | &Err(mut x) in std::iter::once(res) {
drop::<u8>(x);
}
for &(Ok(x) | Err(x)) in std::iter::once(res) {
drop::<u8>(x);
}
for Ok(x) | Err(x) in std::iter::once(res) {
drop::<&u8>(x);
}
fn f1((Ok(mut x) | &Err(mut x)): R<'_>) {
drop::<u8>(x);
}
fn f2(&(Ok(x) | Err(x)): R<'_>) {
drop::<u8>(x);
}
fn f3((Ok(x) | Err(x)): R<'_>) {
drop::<&u8>(x);
}
// Wrap inside another type (a product for a simplity with irrefutable contexts).
#[derive(Copy, Clone)]
struct Wrap<T>(T);
let wres = Wrap(res);
match wres {
Wrap(Ok(mut x) | &Err(mut x)) => drop::<u8>(x),
}
match wres {
Wrap(&(Ok(x) | Err(x))) => drop::<u8>(x),
}
match wres {
Wrap(Ok(x) | Err(x)) => drop::<&u8>(x),
}
if let Wrap(Ok(mut x) | &Err(mut x)) = wres {
drop::<u8>(x);
}
if let Wrap(&(Ok(x) | Err(x))) = wres {
drop::<u8>(x);
}
if let Wrap(Ok(x) | Err(x)) = wres {
drop::<&u8>(x);
}
let Wrap(Ok(mut x) | &Err(mut x)) = wres;
drop::<u8>(x);
let Wrap(&(Ok(x) | Err(x))) = wres;
drop::<u8>(x);
let Wrap(Ok(x) | Err(x)) = wres;
drop::<&u8>(x);
for Wrap(Ok(mut x) | &Err(mut x)) in std::iter::once(wres) {
drop::<u8>(x);
}
for Wrap(&(Ok(x) | Err(x))) in std::iter::once(wres) {
drop::<u8>(x);
}
for Wrap(Ok(x) | Err(x)) in std::iter::once(wres) {
drop::<&u8>(x);
}
fn fw1(Wrap(Ok(mut x) | &Err(mut x)): Wrap<R<'_>>) {
drop::<u8>(x);
}
fn fw2(Wrap(&(Ok(x) | Err(x))): Wrap<R<'_>>) {
drop::<u8>(x);
}
fn fw3(Wrap(Ok(x) | Err(x)): Wrap<R<'_>>) {
drop::<&u8>(x);
}
// Nest some more:
enum Tri<P> {
A(P),
B(P),
C(P),
}
let tri = &Tri::A(&Ok(0));
let (Tri::A(Ok(mut x) | Err(mut x))
| Tri::B(&Ok(mut x) | Err(mut x))
| &Tri::C(Ok(mut x) | Err(mut x))) = tri;
drop::<u8>(x);
match tri {
Tri::A(Ok(mut x) | Err(mut x))
| Tri::B(&Ok(mut x) | Err(mut x))
| &Tri::C(Ok(mut x) | Err(mut x)) => drop::<u8>(x),
}
}
|
