Rollup merge of #90117 - calebsander:fix/rsplit-clone, r=yaahc

Make RSplit<T, P>: Clone not require T: Clone

This addresses a TODO comment. The behavior of `#[derive(Clone)]` *does* result in a `T: Clone` requirement. Playground example:
https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=a8b1a9581ff8893baf401d624a53d35b

Add a manual `Clone` implementation, mirroring `Split` and `SplitInclusive`.
`(R)?SplitN(Mut)?` don't have any `Clone` implementations, but I'll leave that for its own pull request.

1 files changed, 11 insertions, 0 deletions

diff --git a/src/test/ui/iterators/rsplit-clone.rs b/src/test/ui/iterators/rsplit-clone.rs
new file mode 100644
index 00000000000..911da742957
--- /dev/null
+++ b/src/test/ui/iterators/rsplit-clone.rs
@@ -0,0 +1,11 @@
+// check-pass
+
+// RSplit<T, P> previously required T: Clone in order to be Clone
+
+struct NotClone;
+
+fn main() {
+    let elements = [NotClone, NotClone, NotClone];
+    let rsplit = elements.rsplit(|_| false);
+    rsplit.clone();
+}