Iterator trait for arrays #7370
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## Description Continuation of FuelLabs#6860. This PR implements `Iterator` trait for arrays, which allows codes like below: ```sway let array: [u64; 3] = [1u64, 2u64, 3u64]; let mut value = 0; for v in array.iter() { value += v; } assert(value == 6); ``` PS: `#allow` and some unrelated changes demanded by `clippy`. ## Checklist - [x] I have linked to any relevant issues. - [x] I have commented my code, particularly in hard-to-understand areas. - [ ] I have updated the documentation where relevant (API docs, the reference, and the Sway book). - [ ] If my change requires substantial documentation changes, I have [requested support from the DevRel team](https://github.com/FuelLabs/devrel-requests/issues/new/choose) - [ ] I have added tests that prove my fix is effective or that my feature works. - [ ] I have added (or requested a maintainer to add) the necessary `Breaking*` or `New Feature` labels where relevant. - [x] I have done my best to ensure that my PR adheres to [the Fuel Labs Code Review Standards](https://github.com/FuelLabs/rfcs/blob/master/text/code-standards/external-contributors.md). - [x] I have requested a review from the relevant team or maintainers.
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Description
Continuation of #6860.
This PR implements
Iteratortrait for arrays, which allows codes like below:PS:
#allowand some unrelated changes demanded byclippy.Checklist
Breaking*orNew Featurelabels where relevant.