mirror of https://github.com/rust-lang/rust
53 lines
1.3 KiB
Rust
53 lines
1.3 KiB
Rust
// check that static methods can assume their trait-ref is well-formed.
|
|
|
|
trait Foo<'a, 'b, T>: Sized {
|
|
fn make_me() -> Self { loop {} }
|
|
fn static_evil(u: &'b u32) -> &'a u32;
|
|
}
|
|
|
|
struct Evil<'a, 'b: 'a>(Option<&'a &'b ()>);
|
|
|
|
impl<'a, 'b> Foo<'a, 'b, Evil<'a, 'b>> for () {
|
|
fn make_me() -> Self { }
|
|
fn static_evil(u: &'b u32) -> &'a u32 {
|
|
u
|
|
}
|
|
}
|
|
|
|
struct IndirectEvil<'a, 'b: 'a>(Option<&'a &'b ()>);
|
|
|
|
impl<'a, 'b> Foo<'a, 'b, ()> for IndirectEvil<'a, 'b> {
|
|
fn make_me() -> Self { IndirectEvil(None) }
|
|
fn static_evil(u: &'b u32) -> &'a u32 {
|
|
let me = Self::make_me();
|
|
loop {} // (`me` could be used for the lifetime transmute).
|
|
}
|
|
}
|
|
|
|
impl<'a, 'b> Evil<'a, 'b> {
|
|
fn inherent_evil(u: &'b u32) -> &'a u32 {
|
|
u
|
|
}
|
|
}
|
|
|
|
// while static methods can *assume* this, we should still
|
|
// *check* that it holds at the use site.
|
|
|
|
fn evil<'a, 'b>(b: &'b u32) -> &'a u32 {
|
|
<()>::static_evil(b)
|
|
//~^ ERROR lifetime may not live long enough
|
|
}
|
|
|
|
fn indirect_evil<'a, 'b>(b: &'b u32) -> &'a u32 {
|
|
<IndirectEvil>::static_evil(b)
|
|
//~^ ERROR lifetime may not live long enough
|
|
}
|
|
|
|
fn inherent_evil<'a, 'b>(b: &'b u32) -> &'a u32 {
|
|
<Evil>::inherent_evil(b)
|
|
//~^ ERROR lifetime may not live long enough
|
|
}
|
|
|
|
|
|
fn main() {}
|