impl PeekingNext for &mut PeekingNext

[ijackson]

Is there some reason we don't have this?

impl<I: PeekingNext> PeekingNext for &mut I { ... }

I can't thinkl of one and I found myself wanting it. Should I prepare an MR?

[scottmcm]

Beware that &mut is fundamental, so this is a breaking change and will need a semver major version bump. (I could have implemented PeekingNext for &mut MyIterator, which this would break.)

I doubt anyone did, but should probably take the bump just in case.

(This problem is why, sadly, we couldn't add impl<E: Extend> Extend for &mut E in core.)

[Philippe-Cholet]

It seems to me that #643 implements exactly this, and it was released in 0.11.0.
I really don't see why it added Self: Sized constraint thought.

[ijackson]

It seems to me that #643 implements exactly this, and it was released in 0.11.0.

So it did, thanks.