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Add #[must_use] to Array::map #140957

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JulianKnodt
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The output of Array::map is intended to be an array of the same size, and does not modify the original in place nor is it intended for side-effects. Thus, under normal circumstances it should be consumed.

See discussion.

Attaching to tracking issue #75243

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rustbot commented May 13, 2025

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@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels May 13, 2025
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The output of Array::map is intended to be an array of the same size, and does not modify the
original in place nor is it intended for side-effects. Thus, under normal circumstances it should be consumed.

See [discussion](https://internals.rust-lang.org/t/array-map-annotate-with-must-use/22813/26).

Attaching to tracking issue rust-lang#75243
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