Lifetime of returned next references

[tommie]

I'm interested in bplustree, because it seems to allow removal/insertion without invalidating iterators, something it seems BTreeMap cannot do without cursors, which are only in nightly.

However, I'm hitting a lifetime issue with RawExclusiveIter::next:

bplustree/src/iter.rs

Line 589 in aedade2

pub fn next(&mut self) -> Option<(&K, &V)> {

The associated type in btree_map::Iter uses the container's lifetime:

type Item = (&'a K, &'a V)

which suggests the returned references should be tagged with 't in bplustree, since the underlying data should be valid even as the iterator is dropped.