std: Remove iter::ByRef
and generalize impls
#21907
Merged
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This removes the
ByRef
iterator adaptor to stay in line with the changes tostd::io
. Theby_ref
method instead just returns&mut Self
.This also removes the implementation of
Iterator for &mut Iterator
and insteadgeneralizes it to
Iterator for &mut I
whereI: Iterator + ?Sized
. TheBox<I>
implementations were also updated.