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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/generic-associated-types/extended/lending_iterator.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/generic-associated-types/extended/lending_iterator.rs')
-rw-r--r-- | src/test/ui/generic-associated-types/extended/lending_iterator.rs | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/src/test/ui/generic-associated-types/extended/lending_iterator.rs b/src/test/ui/generic-associated-types/extended/lending_iterator.rs new file mode 100644 index 000000000..ede164766 --- /dev/null +++ b/src/test/ui/generic-associated-types/extended/lending_iterator.rs @@ -0,0 +1,39 @@ +// revisions: base extended +//[base] check-fail +//[extended] check-pass + +#![feature(generic_associated_types)] +#![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() {} |