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Add a strange test for unsafe_code lint. #89821

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merged 1 commit into from
Oct 15, 2021
Merged

Add a strange test for unsafe_code lint. #89821

merged 1 commit into from
Oct 15, 2021

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crlf0710
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@crlf0710 crlf0710 commented Oct 12, 2021 •
edited by the8472
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The current behavior is a little surprising to me. I'm not sure whether people would change it, but at least let me document the current behavior with a test.

I learnt about this from the totally-speedy-transmute crate.

cc #10599 the original implementation pr.

@crlf0710 crlf0710 added A-testsuite Area: The testsuite used to check the correctness of rustc A-lint Area: Lints (warnings about flaws in source code) such as unused_mut. labels Oct 12, 2021
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r? @Mark-Simulacrum

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@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Oct 12, 2021
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taiki-e commented Oct 12, 2021

cc #10599 the original implementation pr.

FYI: #52467 is the PR that introduced the current behavior.

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I think the particular case tested here probably shouldn't lint, since the macro has requested a call site span. However, I believe the lint doesn't currently consider the span of the unsafe block at all.

That seems like it might be good to fix to help with writing macros which enforce safety through static checking at compile-time (like println!) and currently can't easily do so without allowing unsafe in their arguments as well, due to needing to make sure the unsafe block is appropriately scoped. For example, see #89139. But it's also totally fine to leave that for future PR(s) or discussions; we can merge the test in the meantime. I think the broader changes here would likely need to start as a T-lang MCP proposing an initiative to look at the unsafe code interaction with macros, though maybe a PR would be small enough to be OK. I'm a little hesitant personally to pursue small steps without a broader plan in mind though here.

@Mark-Simulacrum Mark-Simulacrum added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Oct 13, 2021
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I think i'd recommend just leave any potential discussions or changes to the future, because any change would quite likely break existing code in the wild. We can just land this test in the test suite so this special case won't get forgotten.

@crlf0710 crlf0710 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 (such as code changes or more information) from the author. labels Oct 13, 2021
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@crlf0710 crlf0710 added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Oct 13, 2021
@crlf0710 crlf0710 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 (such as code changes or more information) from the author. labels Oct 13, 2021
@Mark-Simulacrum Mark-Simulacrum added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Oct 14, 2021
@apiraino apiraino added the T-infra Relevant to the infrastructure team, which will review and decide on the PR/issue. label Oct 14, 2021
@crlf0710 crlf0710 added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-infra Relevant to the infrastructure team, which will review and decide on the PR/issue. labels Oct 14, 2021
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@bors r+

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bors commented Oct 15, 2021

📌 Commit c76c620 has been approved by Mark-Simulacrum

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Oct 15, 2021
@matthiaskrgr matthiaskrgr mentioned this pull request Oct 15, 2021
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bors added a commit to rust-lang-ci/rust that referenced this pull request Oct 15, 2021
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Auto merge of rust-lang#89903 - matthiaskrgr:rollup-s0c69xl, r=matthi…
72d6606 
…askrgr

Rollup of 7 pull requests

Successful merges:

 - rust-lang#86011 (move implicit `Sized` predicate to end of list)
 - rust-lang#89821 (Add a strange test for `unsafe_code` lint.)
 - rust-lang#89859 (add dedicated error variant for writing the discriminant of an uninhabited enum variant)
 - rust-lang#89870 (Suggest Box::pin when Pin::new is used instead)
 - rust-lang#89880 (Use non-checking TLS relocation in aarch64 asm! sym test.)
 - rust-lang#89885 (add long explanation for E0183)
 - rust-lang#89894 (Remove unused dependencies from rustc_const_eval)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit b74ae04 into rust-lang:master Oct 15, 2021
@rustbot rustbot added this to the 1.57.0 milestone Oct 15, 2021
@crlf0710 crlf0710 deleted the unsafe_code_lint_test branch January 24, 2022 09:48
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