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