mirror of https://github.com/rust-lang/rust
49 lines
1009 B
Rust
49 lines
1009 B
Rust
// Test that if a struct declares multiple region bounds for a given
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// type parameter, an explicit lifetime bound is required on object
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// lifetimes within.
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#![allow(dead_code)]
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trait Test {
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fn foo(&self) { }
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}
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struct Ref0<T:?Sized> {
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r: *mut T
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}
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struct Ref1<'a,T:'a+?Sized> {
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r: &'a T
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}
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struct Ref2<'a,'b:'a,T:'a+'b+?Sized> {
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r: &'a &'b T
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}
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fn a<'a,'b>(t: Ref2<'a,'b, dyn Test>) {
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//~^ ERROR lifetime bound for this object type cannot be deduced from context
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}
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fn b(t: Ref2<dyn Test>) {
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//~^ ERROR lifetime bound for this object type cannot be deduced from context
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}
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fn c(t: Ref2<&dyn Test>) {
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// In this case, the &'a overrides.
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}
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fn d(t: Ref2<Ref1<dyn Test>>) {
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// In this case, the lifetime parameter from the Ref1 overrides.
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}
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fn e(t: Ref2<Ref0<dyn Test>>) {
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// In this case, Ref2 is ambiguous, but Ref0 overrides with 'static.
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}
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fn f(t: &Ref2<dyn Test>) {
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//~^ ERROR lifetime bound for this object type cannot be deduced from context
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}
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fn main() {
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}
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