| // 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 |
| } |
| |
| pub trait Foo<'a, 't> { |
| fn no_bound<'b>(self, b: Inv<'b>); |
| fn has_bound<'b:'a>(self, b: Inv<'b>); |
| fn wrong_bound1<'b,'c,'d:'a+'b>(self, b: Inv<'b>, c: Inv<'c>, d: Inv<'d>); |
| fn wrong_bound2<'b,'c,'d:'a+'b>(self, b: Inv<'b>, c: Inv<'c>, d: Inv<'d>); |
| fn okay_bound<'b,'c,'d:'a+'b+'c>(self, b: Inv<'b>, c: Inv<'c>, d: Inv<'d>); |
| fn another_bound<'x: 'a>(self, x: Inv<'x>, y: Inv<'t>); |
| } |
| |
| impl<'a, 't> Foo<'a, 't> for &'a isize { |
| fn no_bound<'b:'a>(self, b: Inv<'b>) { |
| //~^ ERROR lifetime parameters or bounds on method `no_bound` do not match |
| } |
| |
| fn has_bound<'b>(self, b: Inv<'b>) { |
| //~^ ERROR lifetime parameters or bounds on method `has_bound` do not match |
| } |
| |
| fn wrong_bound1<'b,'c,'d:'a+'c>(self, b: Inv<'b>, c: Inv<'c>, d: Inv<'d>) { |
| //~^ ERROR method not compatible with trait |
| //~| ERROR method not compatible with trait |
| // |
| // Note: This is a terrible error message. It is caused |
| // because, in the trait, 'b is early bound, and in the impl, |
| // 'c is early bound, so -- after substitution -- the |
| // lifetimes themselves look isomorphic. We fail because the |
| // lifetimes that appear in the types are in the wrong |
| // order. This should really be fixed by keeping more |
| // information about the lifetime declarations in the trait so |
| // that we can compare better to the impl, even in cross-crate |
| // cases. |
| } |
| |
| fn wrong_bound2(self, b: Inv, c: Inv, d: Inv) { |
| //~^ ERROR lifetime parameters or bounds on method `wrong_bound2` do not match the trait |
| } |
| |
| fn okay_bound<'b,'c,'e:'b+'c>(self, b: Inv<'b>, c: Inv<'c>, e: Inv<'e>) { |
| } |
| |
| fn another_bound<'x: 't>(self, x: Inv<'x>, y: Inv<'t>) { |
| //~^ ERROR E0276 |
| } |
| } |
| |
| fn main() { } |
