Add core::iter::adapters::PeekMap and core::iter::Peekable::peek_map

[MiguelX413]

Add a feature called peak_map.
I need to add further documentation but do need guidance as it's my first time contributing to Rust.

[rustbot]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @m-ou-se (or someone else) soon.

Please see the contribution instructions for more information. Namely, in order to ensure the minimum review times lag, PR authors and assigned reviewers should ensure that the review label (S-waiting-on-review and S-waiting-on-author) stays updated, invoking these commands when appropriate:

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[the8472]

You may want to file an ACP for discussion. It's not strictly required but it'll make it easier to separate API from implementation discussion.

[MiguelX413]

You may want to file an ACP for discussion. It's not strictly required but it'll make it easier to separate API from implementation discussion.

I'll look into that! Thank you! @the8472

[the8472]

You can leave out the unsafe trait impls if they cause issues. They exist for perf optimizations and can be added later if necessary.

[the8472]

btw, you can run syntax-checking locally with ./x check core --stage 0

https://rustc-dev-guide.rust-lang.org/building/how-to-build-and-run.html

[MiguelX413]

btw, you can run syntax-checking locally with ./x check core --stage 0

https://rustc-dev-guide.rust-lang.org/building/how-to-build-and-run.html

Noted, thank you.

[Noratrieb]

Have you made the ACP already? I don't see one linked. I'm gonna make this as waiting on you for the ACP to be accepted. Use @rustbot ready when it has been accepted.
@rustbot author

[Dylan-DPC]

@MiguelX413 any updates on creating the ACP? thanks

[bors]

☔ The latest upstream changes (presumably #125443) made this pull request unmergeable. Please resolve the merge conflicts.

[Dylan-DPC]

Closing this as no ACP was created or linked to the pr