| // Check that explicit region bounds are allowed on the various |
| // nominal types (but not on other types) and that they are type |
| // checked. |
| |
| struct Inv<'a> { // invariant w/r/t 'a |
| x: &'a mut &'a isize |
| } |
| |
| trait Foo<'x> { |
| fn method<'y:'x>(self, y: Inv<'y>); |
| } |
| |
| fn caller1<'a,'b,F:Foo<'a>>(a: Inv<'a>, b: Inv<'b>, f: F) { |
| // Here the value provided for 'y is 'a, and hence 'a:'a holds. |
| f.method(a); |
| } |
| |
| fn caller2<'a,'b,F:Foo<'a>>(a: Inv<'a>, b: Inv<'b>, f: F) { |
| // Here the value provided for 'y is 'b, and hence 'b:'a does not hold. |
| f.method(b); //~ ERROR lifetime mismatch [E0623] |
| } |
| |
| fn caller3<'a,'b:'a,F:Foo<'a>>(a: Inv<'a>, b: Inv<'b>, f: F) { |
| // Here the value provided for 'y is 'b, and hence 'b:'a holds. |
| f.method(b); |
| } |
| |
| fn main() { } |