Make Peekable remember peeking a None #37834
Merged
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Peekable should remember if a None has been seen in the
.peek()
method.It ensures that
.peek(); .peek();
or.peek(); .next();
only advances theunderlying iterator at most once. This does not by itself make the iterator
fused.
Thanks to @s3bk for the code in
fn peek()
itself.Fixes #37784