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use transmute for ptr::invalid #8

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Merged
merged 3 commits into from
May 21, 2022
Merged

use transmute for ptr::invalid #8

merged 3 commits into from
May 21, 2022

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RalfJung
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This syncs with rust-lang/rust#97219

@RalfJung
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Ah, Rust 1.31 doesn't have transmute in CTFE yet. That only became stable in 1.46.0.

We could implement it via a union instead.

@RalfJung
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Actually that won't help; unions and transmute inside const fn both only became stable in rust-lang/rust#85769 (Rust 1.56).

So on older Rust, it is not possible to implement this as a const fn.

RalfJung added 2 commits May 21, 2022 08:47
@RalfJung
only do the transmuting in Miri
4cabc22 
Miri only works on nightly so we will have the feature there
@RalfJung
ensure it actually builds and works in Miri
88632b5
@Gankra Gankra merged commit 796f0f2 into Gankra:main May 21, 2022
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Gankra commented May 21, 2022

thanks! i'll try to cut a release some time this weekend

@RalfJung RalfJung deleted the invalid branch May 29, 2022 06:30
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@RalfJung @Gankra