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Suggest pointer::cast when possible in transmute_ptr_to_ref #8939

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Merged
merged 1 commit into from
Jun 27, 2022
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Suggest pointer::cast when possible in transmute_ptr_to_ref #8939

merged 1 commit into from
Jun 27, 2022

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Jarcho
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@Jarcho Jarcho commented Jun 4, 2022

fixes #8924

changelog: Suggest casting the pointer for any type containing lifetimes in transmute_ptr_to_ref.
changelog: Suggest pointer::cast when possible in transmute_ptr_to_ref.

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r? @giraffate

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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 Jun 4, 2022
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Jarcho commented Jun 4, 2022

Apparently casting *const &'a T to *const &'b T directly doesn't work with as. Not sure if double cast as a workaround is really better than transmute.

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giraffate reviewed Jun 22, 2022
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Sorry for the late reviewing. I made comments.

clippy_utils/src/msrvs.rs Outdated
@@ -25,7 +25,7 @@ msrv_aliases! {
1,40,0 { MEM_TAKE, NON_EXHAUSTIVE, OPTION_AS_DEREF }
1,38,0 { POINTER_CAST }
1,37,0 { TYPE_ALIAS_ENUM_VARIANTS }
1,36,0 { ITERATOR_COPIED }
1,36,0 { ITERATOR_COPIED, PTR_CAST }
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What method is this? I thought it was this, but it looks like this was added at 1.38.0.

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That is the right method. I don't know where I got 1.36 from.

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Okay. Can 1,38,0 { POINTER_CAST } be used for msrv?

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Suggest pointer::cast when possible in transmute_ptr_to_ref
7cdaabc 
Defensively add a cast to any type with lifetimes.
@Jarcho Jarcho force-pushed the transmute_ptr_to_ref_lt branch from 20e0273 to 7cdaabc Compare June 25, 2022 11:55
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@bors r+

It looks good, thanks!

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bors commented Jun 27, 2022

📌 Commit 7cdaabc has been approved by giraffate

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bors commented Jun 27, 2022

⌛ Testing commit 7cdaabc with merge 88da5f2...

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bors commented Jun 27, 2022

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: giraffate
Pushing 88da5f2 to master...

@bors bors merged commit 88da5f2 into rust-lang:master Jun 27, 2022
@bors bors mentioned this pull request Jun 27, 2022
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transmute_ptr_to_ref false positive for types containing differing lifetimes
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