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Add size hints to early binder iterator adapters #104731

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Merged
merged 1 commit into from
Nov 26, 2022
Merged

Add size hints to early binder iterator adapters #104731

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12 changes: 12 additions & 0 deletions compiler/rustc_middle/src/ty/subst.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -589,6 +589,10 @@ where
fn next(&mut self) -> Option<Self::Item> {
Some(EarlyBinder(self.it.next()?).subst(self.tcx, self.substs))
}

fn size_hint(&self) -> (usize, Option<usize>) {
self.it.size_hint()
}
}

impl<'tcx, I: IntoIterator> DoubleEndedIterator for SubstIter<'_, 'tcx, I>
Expand Down Expand Up @@ -631,6 +635,10 @@ where
fn next(&mut self) -> Option<Self::Item> {
Some(EarlyBinder(*self.it.next()?).subst(self.tcx, self.substs))
}

fn size_hint(&self) -> (usize, Option<usize>) {
self.it.size_hint()
}
}

impl<'tcx, I: IntoIterator> DoubleEndedIterator for SubstIterCopied<'_, 'tcx, I>
Expand Down Expand Up @@ -660,6 +668,10 @@ impl<T: Iterator> Iterator for EarlyBinderIter<T> {
fn next(&mut self) -> Option<Self::Item> {
self.t.next().map(|i| EarlyBinder(i))
}

fn size_hint(&self) -> (usize, Option<usize>) {
self.t.size_hint()
}
}

impl<'tcx, T: TypeFoldable<'tcx>> ty::EarlyBinder<T> {
Expand Down