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Explain a test

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This commit is contained in:
Matthew Jasper 2019-12-26 21:13:51 +00:00
parent 35071e3e2e
commit 033bd8c7af
1 changed files with 9 additions and 2 deletions
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11
src/test/ui/impl-trait/multiple-lifetimes/error-handling.rs
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@ -12,10 +12,17 @@ type E<'a, 'b> = impl Sized;
fn foo<'a, 'b, 'c>(x: &'static i32, mut y: &'a i32) -> E<'b, 'c> {
//~^ ERROR lifetime may not live long enough
let v = CopyIfEq::<*mut _, *mut _>(&mut {x}, &mut y);
let v = CopyIfEq::<*mut _, *mut _>(&mut { x }, &mut y);
// This assignment requires that `x` and `y` have the same type due to the
// `Copy` impl. The reason why we are using a copy to create a constraint
// is that only borrow checking (not regionck in type checking) enforces
// this bound.
let u = v;
let _: *mut &'a i32 = u.1;
unsafe { let _: &'b i32 = *u.0; }
unsafe {
let _: &'b i32 = *u.0;
}
u.0
}