43 lines
1.0 KiB
Rust
43 lines
1.0 KiB
Rust
// Test a trait (`Bar`) with a higher-ranked supertrait.
|
|
#![allow(unconditional_recursion)]
|
|
|
|
trait Foo<'tcx> {
|
|
fn foo(&'tcx self) -> &'tcx isize;
|
|
}
|
|
|
|
trait Bar<'ccx>: for<'tcx> Foo<'tcx> {
|
|
fn bar(&'ccx self) -> &'ccx isize;
|
|
}
|
|
|
|
fn want_foo_for_some_tcx<'x, F: Foo<'x>>(f: &'x F) {
|
|
want_foo_for_some_tcx(f);
|
|
want_foo_for_any_tcx(f);
|
|
//~^ ERROR lifetime may not live long enough
|
|
//~| ERROR implementation of `Foo` is not general enough
|
|
}
|
|
|
|
fn want_foo_for_any_tcx<F: for<'tcx> Foo<'tcx>>(f: &F) {
|
|
want_foo_for_some_tcx(f);
|
|
want_foo_for_any_tcx(f);
|
|
}
|
|
|
|
fn want_bar_for_some_ccx<'x, B: Bar<'x>>(b: &B) {
|
|
want_foo_for_some_tcx(b);
|
|
want_foo_for_any_tcx(b);
|
|
|
|
want_bar_for_some_ccx(b);
|
|
want_bar_for_any_ccx(b);
|
|
//~^ ERROR lifetime may not live long enough
|
|
//~| ERROR implementation of `Bar` is not general enough
|
|
}
|
|
|
|
fn want_bar_for_any_ccx<B: for<'ccx> Bar<'ccx>>(b: &B) {
|
|
want_foo_for_some_tcx(b);
|
|
want_foo_for_any_tcx(b);
|
|
|
|
want_bar_for_some_ccx(b);
|
|
want_bar_for_any_ccx(b);
|
|
}
|
|
|
|
fn main() {}
|