diff options
Diffstat (limited to 'tests/ui/generic-associated-types/extended/lending_iterator.rs')
-rw-r--r-- | tests/ui/generic-associated-types/extended/lending_iterator.rs | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/tests/ui/generic-associated-types/extended/lending_iterator.rs b/tests/ui/generic-associated-types/extended/lending_iterator.rs new file mode 100644 index 000000000..247761dd0 --- /dev/null +++ b/tests/ui/generic-associated-types/extended/lending_iterator.rs @@ -0,0 +1,38 @@ +// revisions: base extended +//[base] check-fail +//[extended] check-pass + +#![cfg_attr(extended, feature(generic_associated_types_extended))] +#![cfg_attr(extended, allow(incomplete_features))] + +pub trait FromLendingIterator<A>: Sized { + fn from_iter<T: for<'x> LendingIterator<Item<'x> = A>>(iter: T) -> Self; +} + +impl<A> FromLendingIterator<A> for Vec<A> { + fn from_iter<I: for<'x> LendingIterator<Item<'x> = A>>(mut iter: I) -> Self { + //[base]~^ impl has stricter + let mut v = vec![]; + while let Some(item) = iter.next() { + v.push(item); + } + v + } +} + +pub trait LendingIterator { + type Item<'z> + where + Self: 'z; + fn next(&mut self) -> Option<Self::Item<'_>>; + + fn collect<A, B: FromLendingIterator<A>>(self) -> B + where + Self: Sized, + Self: for<'q> LendingIterator<Item<'q> = A>, + { + <B as FromLendingIterator<A>>::from_iter(self) + } +} + +fn main() {} |