mirror of https://github.com/rust-lang/rust
61 lines
1.9 KiB
Rust
61 lines
1.9 KiB
Rust
fn id<T>(x: T) -> T { x }
|
|
|
|
fn f() {
|
|
let old = ['o']; // statement 0
|
|
let mut v1 = Vec::new(); // statement 1
|
|
|
|
let mut v2 = Vec::new(); // statement 2
|
|
|
|
{
|
|
let young = ['y']; // statement 3
|
|
//~^ NOTE binding `young` declared here
|
|
|
|
v2.push(&young[0]); // statement 4
|
|
//~^ ERROR `young[_]` does not live long enough
|
|
//~| NOTE borrowed value does not live long enough
|
|
} //~ NOTE `young[_]` dropped here while still borrowed
|
|
|
|
let mut v3 = Vec::new(); // statement 5
|
|
|
|
v3.push(&id('x')); // statement 6
|
|
//~^ ERROR temporary value dropped while borrowed
|
|
//~| NOTE creates a temporary value which is freed while still in use
|
|
//~| NOTE temporary value is freed at the end of this statement
|
|
//~| HELP consider using a `let` binding to create a longer lived value
|
|
|
|
{
|
|
|
|
let mut v4 = Vec::new(); // (sub) statement 0
|
|
|
|
v4.push(&id('y'));
|
|
//~^ ERROR temporary value dropped while borrowed
|
|
//~| NOTE creates a temporary value which is freed while still in use
|
|
//~| NOTE temporary value is freed at the end of this statement
|
|
//~| NOTE consider using a `let` binding to create a longer lived value
|
|
v4.use_ref();
|
|
//~^ NOTE borrow later used here
|
|
} // (statement 7)
|
|
|
|
let mut v5 = Vec::new(); // statement 8
|
|
|
|
v5.push(&id('z'));
|
|
//~^ ERROR temporary value dropped while borrowed
|
|
//~| NOTE creates a temporary value which is freed while still in use
|
|
//~| NOTE temporary value is freed at the end of this statement
|
|
//~| HELP consider using a `let` binding to create a longer lived value
|
|
|
|
v1.push(&old[0]);
|
|
|
|
(v1, v2, v3, /* v4 is above. */ v5).use_ref();
|
|
//~^ NOTE borrow later used here
|
|
//~| NOTE borrow later used here
|
|
//~| NOTE borrow later used here
|
|
}
|
|
|
|
fn main() {
|
|
f();
|
|
}
|
|
|
|
trait Fake { fn use_mut(&mut self) { } fn use_ref(&self) { } }
|
|
impl<T> Fake for T { }
|