feat: Iterator::count

[MagisterDallis]

Encountering a compilation panic on this one. I'm wondering if it's because of the unused closure argument?

[reviewable-StarkWare]

This change is 

[orizi]

are you based over latest? there was a fix for something similar merged lately.

Reviewed all commit messages.
Reviewable status: 0 of 2 files reviewed, all discussions resolved

[MagisterDallis]

yes, this is based on 3e611b5

Reviewable status: 0 of 2 files reviewed, all discussions resolved (waiting on @orizi)

[orizi]

Reviewable status: 0 of 2 files reviewed, 1 unresolved discussion (waiting on @MagisterDallis)

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corelib/src/iter/traits/iterator.cairo line 80 at r1 (raw file):

    ) -> usize {
        let mut self = self;
        Self::fold(ref self, 0_usize, |count, _x| {

can you try removing anything that would need to be inferred?

(specifically - i highly suspect Self::Item of being the culprit of this not working)

Suggestion:

        Self::fold::<usize>(ref self, 0_usize, |count: usize, _x: Self::Item| {

[MagisterDallis]

Reviewable status: 0 of 2 files reviewed, 1 unresolved discussion (waiting on @orizi)

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corelib/src/iter/traits/iterator.cairo line 80 at r1 (raw file):

Previously, orizi wrote…

can you try removing anything that would need to be inferred?

(specifically - i highly suspect Self::Item of being the culprit of this not working)

Even with explicit types, this still happens.