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New lint: copy_then_borrow_mut #13984

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New lint: copy_then_borrow_mut #13984

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samueltardieu
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This detects when the result of a block, with a Copy type, is borrowed mutably. The user might not be aware that using a block will borrow a copy instead of the value expression itself.

changelog: [copy_then_borrow_mut]: new lint

Close #13967

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rustbot commented Jan 11, 2025

r? @blyxyas

rustbot has assigned @blyxyas.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

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@rustbot rustbot added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties label Jan 11, 2025
@samueltardieu samueltardieu force-pushed the push-kpvspntvlrtr branch 2 times, most recently from a881f75 to 1ac5de7 Compare January 12, 2025 08:37
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Rebased

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r? @Clippy

@rustbot rustbot assigned flip1995 and unassigned blyxyas Jan 31, 2025
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Rebased

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Rebased

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@flip1995 Anything else needs to be done?

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I guess the FCP on Zulip. Feel free to start that :)

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FCP opened on https://rust-lang.zulipchat.com/#narrow/stream/257328-clippy/topic/FCP.3A.20copy_then_borrow_mut

@samueltardieu samueltardieu force-pushed the push-kpvspntvlrtr branch 2 times, most recently from 410fe93 to b0e27cc Compare February 28, 2025 14:15
@samueltardieu samueltardieu force-pushed the push-kpvspntvlrtr branch 4 times, most recently from eac9c71 to 5309578 Compare March 25, 2025 21:58
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Rebased

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@flip1995 flip1995 Awaiting requested review from flip1995

@Alexendoo Alexendoo Awaiting requested review from Alexendoo

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reborrow or copy-then-borrow
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