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New lint: nonnull_unchecked_on_box_ptr#17336

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New lint: nonnull_unchecked_on_box_ptr#17336
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ArhanChaudhary:lint-nonnull_unchecked_on_box_ptr

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@ArhanChaudhary ArhanChaudhary commented Jul 3, 2026 •
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changelog: [nonnull_unchecked_on_box_ptr]: implement new lint

Now that NonNull::from_mut is stable, we can check and suggest a fix against a common pattern: using unsafe { NonNull::new_unchecked(Box::into_raw(x)) } instead of NonNull::from_mut(Box::leak(x)). This was first mentioned in this comment.

  • Followed [lint naming conventions][lint_naming]
  • Added passing UI tests (including committed .stderr file)
  • cargo test passes locally
  • Executed cargo dev update_lints
  • Added lint documentation
  • Run cargo dev fmt

@rustbot rustbot added needs-fcp PRs that add, remove, or rename lints and need an FCP S-waiting-on-review Status: Awaiting review from the assignee but also interested parties labels Jul 3, 2026
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r? @Jarcho

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@ArhanChaudhary
ArhanChaudhary force-pushed the lint-nonnull_unchecked_on_box_ptr branch 2 times, most recently from 31e604e to d5ef013 Compare July 3, 2026 02:19
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Jarcho requested changes Jul 4, 2026
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You can suggest NonNull::from instead of NonNull::from_mut which will bring the MSRV down to 1.26 (for Box::leak).

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Comment thread clippy_lints/src/nonnull_unchecked_on_box_ptr.rs Outdated
Comment thread clippy_lints/src/nonnull_unchecked_on_box_ptr.rs Outdated
Comment thread clippy_lints/src/nonnull_unchecked_on_box_ptr.rs
@rustbot rustbot added S-waiting-on-author Status: This is awaiting some action from the author. (Use `@rustbot ready` to update this status) and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties labels Jul 4, 2026
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rustbot commented Jul 4, 2026

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Reminder, once the PR becomes ready for a review, use @rustbot ready.

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Jarcho commented Jul 4, 2026

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@rustbot label lint-nominated

@rustbot rustbot added the lint-nominated Create an FCP-thread on Zulip for this PR label Jul 4, 2026
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This lint has been nominated for inclusion.

A FCP topic has been created on Zulip.

@ArhanChaudhary

ArhanChaudhary commented Jul 4, 2026

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Note: this implementation will need to be updated to suggest Box::from_non_null (rust-lang/rust#130364) once that is merged.

@ArhanChaudhary

ArhanChaudhary commented Jul 4, 2026

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@Jarcho How does this look?

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ArhanChaudhary commented Jul 4, 2026

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I suggest from_mut if the MSRV matches. Do you think the lint description should mention from or from_mut?

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github-actions Bot commented Jul 4, 2026 •
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Lintcheck changes for 8842d46

Lint Added Removed Changed
clippy::nonnull_unchecked_on_box_ptr 1 0 0

This comment will be updated if you push new changes

@ArhanChaudhary

ArhanChaudhary commented Jul 5, 2026

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@rustbot ready

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties and removed S-waiting-on-author Status: This is awaiting some action from the author. (Use `@rustbot ready` to update this status) labels Jul 5, 2026
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ArhanChaudhary force-pushed the lint-nonnull_unchecked_on_box_ptr branch from 698355c to 25f3a7e Compare July 6, 2026 17:50
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Jarcho
Jarcho requested changes Jul 11, 2026
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Implementation looks fine bar one nit. Can you squash the commits down please.

I'll leave this FCP open for a few more days before merging.

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Comment thread clippy_lints/src/nonnull_unchecked_on_box_ptr.rs Outdated
@rustbot rustbot added S-waiting-on-author Status: This is awaiting some action from the author. (Use `@rustbot ready` to update this status) and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties labels Jul 11, 2026
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ArhanChaudhary commented Jul 11, 2026

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@rustbot squash

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ArhanChaudhary commented Jul 11, 2026

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Oh, this isn't bors, forgot

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ArhanChaudhary force-pushed the lint-nonnull_unchecked_on_box_ptr branch from 96e70a6 to 05132ba Compare July 11, 2026 03:19
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ArhanChaudhary force-pushed the lint-nonnull_unchecked_on_box_ptr branch from 05132ba to 3a1e8f6 Compare July 11, 2026 18:19
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ArhanChaudhary force-pushed the lint-nonnull_unchecked_on_box_ptr branch from 3a1e8f6 to 8842d46 Compare July 20, 2026 07:52
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This PR was rebased onto a different master commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

@Jarcho

Jarcho commented Jul 20, 2026

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You'll need to import traits using as _ now unless you need to name them.

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