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Cheat around the unsafe_code lint in the select macro #430

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Cheat around the unsafe_code lint in the select macro #430

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ghost
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@ghost ghost commented Oct 16, 2019

Fixes #405.

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taiki-e commented Oct 16, 2019 •
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As #[forbid(unsafe_code)] does not forbid unsafe code generated by macros, I think it is sufficient to just remove #[allow(unsafe_code)].

UPDATE: I've filed #431 as an alternative to this PR.

@taiki-e taiki-e mentioned this pull request Oct 16, 2019
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jeehoonkang
jeehoonkang approved these changes Oct 16, 2019
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crossbeam-channel/src/select_macro.rs
@@ -1212,3 +1207,14 @@ macro_rules! select {
)
};
}

/// Same as `std::mem::transmute`, except the function is not marked with `unsafe`.
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Pedantically speaking, undefined behavior may be invoked because of the absence of unsafe. Not that I'm opposing to this change, but how about saying it's a HACK?

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Oh, I'm sorry not to notice that #431 tries to replace it. #431 looks better if it's correct, but I'm not an expert to decide whether it's correct...

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taiki-e commented Oct 17, 2019

The way used by #431 doesn't seem to work on Rust 1.28. The current behavior is probably because of rust-lang/rust#52467 and seems to be available after 1.29. (fyi: rust-lang/rust#53975)

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ghost commented Oct 22, 2019

Closing in favor of #431

@ghost ghost closed this Oct 22, 2019
bors bot added a commit that referenced this pull request May 20, 2020
@bors @taiki-e
Merge #431
5f3be95 
431: Remove #[allow(unsafe_code)] from select! macro r=taiki-e a=taiki-e

Replaces #430 

Closes #405 

Co-authored-by: Taiki Endo <te316e89@gmail.com>
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Unable to use select macro in #![forbid(unsafe_code)] environments
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