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// Test HRTB supertraits with several levels of expansion required.
trait Foo<'tcx>
{
fn foo(&'tcx self) -> &'tcx isize;
}
trait Bar<'ccx>
: for<'tcx> Foo<'tcx>
{
fn bar(&'ccx self) -> &'ccx isize;
}
trait Baz
: for<'ccx> Bar<'ccx>
{
fn dummy(&self);
}
trait Qux
: Bar<'static>
{
fn dummy(&self);
}
fn want_foo_for_any_tcx<F>(f: &F)
where F : for<'tcx> Foo<'tcx>
{
}
fn want_bar_for_any_ccx<B>(b: &B)
where B : for<'ccx> Bar<'ccx>
{
}
fn want_baz<B>(b: &B)
where B : Baz
{
want_foo_for_any_tcx(b);
want_bar_for_any_ccx(b);
}
fn want_qux<B>(b: &B)
where B : Qux
{
want_foo_for_any_tcx(b);
want_bar_for_any_ccx(b); //~ ERROR
}
fn main() {}
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