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1.36 changes the UnwindSafe impl precondition for HashMap #62301

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CAD97 opened this issue Jul 2, 2019 · 3 comments · Fixed by #62304
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1.36 changes the UnwindSafe impl precondition for HashMap #62301

CAD97 opened this issue Jul 2, 2019 · 3 comments · Fixed by #62304
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A-collections Area: `std::collection` C-bug Category: This is a bug. regression-from-stable-to-beta Performance or correctness regression from stable to beta. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.

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@CAD97
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CAD97 commented Jul 2, 2019 •
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https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=0e5a528fc978a90aa15bbf01f68dd1bf

assert_unwind_safe::<HashMap<(), UnsafeCell<()>>>();

Successfully compiles on stable 1.35, fails on beta/pre 1.36.
@jonas-schievink jonas-schievink added C-bug Category: This is a bug. I-nominated regression-from-stable-to-beta Performance or correctness regression from stable to beta. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue. A-collections Area: `std::collection` labels Jul 2, 2019
@CAD97
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CAD97 commented Jul 2, 2019

First reported to FireFox ESR and shared on irlo here: https://internals.rust-lang.org/t/rust-1-36-0-pre-release-testing/10490/2?u=cad97

@SimonSapin
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rust/src/libstd/panic.rs

Lines 209 to 212 in ef064d2

#[unstable(feature = "ptr_internals", issue = "0")]
impl<T: UnwindSafe + ?Sized> UnwindSafe for Unique<T> {}
#[stable(feature = "nonnull", since = "1.25.0")]
impl<T: RefUnwindSafe + ?Sized> UnwindSafe for NonNull<T> {}

The UnwindSafe impl for Unique<T> requires T: UnwindSafe, but the one for NonZero<T> requires T: RefUnwindSafe.

@SimonSapin SimonSapin mentioned this issue Jul 2, 2019
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@SimonSapin
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#62304 is a possible fix.

SimonSapin added a commit to SimonSapin/rust that referenced this issue Jul 2, 2019
@SimonSapin
HashMap is UnwindSafe
7454b29 
Fixes rust-lang#62301, a regression in 1.36.0 which was caused by hashbrown using `NonZero<T>` where the older hashmap used `Unique<T>`.
Mark-Simulacrum pushed a commit to Mark-Simulacrum/rust that referenced this issue Jul 2, 2019
@SimonSapin @Mark-Simulacrum
HashMap is UnwindSafe
3e9fc8c 
Fixes rust-lang#62301, a regression in 1.36.0 which was caused by hashbrown using `NonZero<T>` where the older hashmap used `Unique<T>`.
bob-beck pushed a commit to openbsd/ports that referenced this issue Jul 2, 2019
@landryb
Fix build with upcoming rust 1.36.
baf80b4 
found by semarie@ in
https://reviews.freebsd.org/D20810#change-K68aYoUXfAu1, regression in
rust itself tracked in rust-lang/rust#62301

Builds fine with rust 1.35.
bob-beck pushed a commit to openbsd/ports that referenced this issue Jul 2, 2019
@landryb
Fix build with upcoming rust 1.36.
266911a 
found by semarie@ in
https://reviews.freebsd.org/D20810#change-K68aYoUXfAu1, regression in
rust itself tracked in rust-lang/rust#62301

Builds fine with rust 1.35.
Mark-Simulacrum added a commit to Mark-Simulacrum/rust that referenced this issue Jul 3, 2019
@Mark-Simulacrum
Rollup merge of rust-lang#62304 - SimonSapin:safe, r=eddyb
5a507d8 
HashMap is UnwindSafe

Fixes rust-lang#62301, a regression in 1.36.0-pre which was caused by hashbrown using `NonZero<T>` where the older hashmap used `Unique<T>`.
Mark-Simulacrum pushed a commit to Mark-Simulacrum/rust that referenced this issue Jul 3, 2019
@SimonSapin @Mark-Simulacrum
HashMap is UnwindSafe
421160e 
Fixes rust-lang#62301, a regression in 1.36.0 which was caused by hashbrown using `NonZero<T>` where the older hashmap used `Unique<T>`.
Mark-Simulacrum added a commit to Mark-Simulacrum/rust that referenced this issue Jul 3, 2019
@Mark-Simulacrum
Rollup merge of rust-lang#62304 - SimonSapin:safe, r=eddyb
a0fcf5e 
HashMap is UnwindSafe

Fixes rust-lang#62301, a regression in 1.36.0-pre which was caused by hashbrown using `NonZero<T>` where the older hashmap used `Unique<T>`.
@Mark-Simulacrum Mark-Simulacrum mentioned this issue Dec 2, 2021
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A-collections Area: `std::collection` C-bug Category: This is a bug. regression-from-stable-to-beta Performance or correctness regression from stable to beta. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
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HashMap is UnwindSafe SimonSapin/rust
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@SimonSapin @jonas-schievink @CAD97