add an associated Item type to IntoIterator
#22313
Merged
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IntoIteratornow has an extra associated item:This lets you bind the iterator "
Item" directly when writing generic functions:The downside is that now you have to write an extra associated type in your
IntoIteratorimplementations:impl<T> IntoIterator for Vec<T> { + type Item = T; type IntoIter = IntoIter<T>; fn into_iter(self) -> IntoIter<T> { .. } }Because this breaks all downstream implementations of
IntoIterator, this is a [breaking-change]r? @aturon