rust/src/test/run-pass/underscore-lifetimes.rs

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#![allow(dead_code)]
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struct Foo<'a>(&'a u8);
fn foo(x: &u8) -> Foo<'_> {
Foo(x)
}
fn foo2(x: &'_ u8) -> Foo<'_> {
Foo(x)
}
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fn foo3(x: &'_ u8) -> Foo {
Foo(x)
}
fn foo4(_: Foo<'_>) {}
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struct Foo2<'a, 'b> {
a: &'a u8,
b: &'b u8,
}
fn foo5<'b>(foo: Foo2<'_, 'b>) -> &'b u8 {
foo.b
}
fn main() {
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let x = &5;
let _ = foo(x);
let _ = foo2(x);
let _ = foo3(x);
foo4(Foo(x));
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let _ = foo5(Foo2 {
a: x,
b: &6,
});
}