mirror of https://github.com/rust-lang/rust
30 lines
786 B
Rust
30 lines
786 B
Rust
// Check that explicit region bounds are allowed on the various
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// nominal types (but not on other types) and that they are type
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// checked.
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struct Inv<'a> { // invariant w/r/t 'a
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x: &'a mut &'a isize
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}
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trait Foo<'x> {
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fn method<'y:'x>(self, y: Inv<'y>);
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}
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fn caller1<'a,'b,F:Foo<'a>>(a: Inv<'a>, b: Inv<'b>, f: F) {
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// Here the value provided for 'y is 'a, and hence 'a:'a holds.
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f.method(a);
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}
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fn caller2<'a,'b,F:Foo<'a>>(a: Inv<'a>, b: Inv<'b>, f: F) {
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// Here the value provided for 'y is 'b, and hence 'b:'a does not hold.
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f.method(b);
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//~^ ERROR lifetime may not live long enough
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}
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fn caller3<'a,'b:'a,F:Foo<'a>>(a: Inv<'a>, b: Inv<'b>, f: F) {
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// Here the value provided for 'y is 'b, and hence 'b:'a holds.
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f.method(b);
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}
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fn main() { }
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