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#![feature(type_alias_impl_trait)]
//@ check-pass
//@ revisions: default edition2021
//@[edition2021]edition: 2021
fn main() {
type T = impl Copy;
let foo: T = Some((1u32, 2u32));
match foo {
None => (),
Some((a, b)) => (),
}
}
fn upvar() {
#[derive(Copy, Clone)]
struct Foo((u32, u32));
type T = impl Copy;
let foo: T = Foo((1u32, 2u32));
let x = move || {
let Foo((a, b)) = foo;
};
}
fn enum_upvar() {
type T = impl Copy;
let foo: T = Some((1u32, 2u32));
let x = move || match foo {
None => (),
Some((a, b)) => (),
};
}
fn r#struct() {
#[derive(Copy, Clone)]
struct Foo((u32, u32));
type U = impl Copy;
let foo: U = Foo((1u32, 2u32));
let Foo((a, b)) = foo;
}
mod only_pattern {
type T = impl Copy;
#[define_opaque(T)]
fn foo(foo: T) {
let (mut x, mut y) = foo;
x = 42;
y = "foo";
}
type U = impl Copy;
#[define_opaque(U)]
fn bar(bar: Option<U>) {
match bar {
Some((mut x, mut y)) => {
x = 42;
y = "foo";
}
None => {}
}
}
type V = impl Copy;
#[define_opaque(V)]
fn baz(baz: Option<V>) {
match baz {
_ => {}
Some((mut x, mut y)) => {
x = 42;
y = "foo";
}
None => {}
}
}
}
mod only_pattern_rpit {
#[allow(unconditional_recursion)]
fn foo(b: bool) -> impl Copy {
let (mut x, mut y) = foo(false);
x = 42;
y = "foo";
if b { panic!() } else { foo(true) }
}
fn bar(b: bool) -> Option<impl Copy> {
if b {
return None;
}
match bar(!b) {
Some((mut x, mut y)) => {
x = 42;
y = "foo";
}
None => {}
}
None
}
}
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