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Add support for `cfg(overflow_checks)` by AngelicosPhosphoros · Pull Request #11...

 1 year ago
source link: https://github.com/rust-lang/rust/pull/111096
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This PR adds support for detecting if overflow checks are enabled in similar fashion as debug_assertions are detected. Possible use-case of this, for example, if we want to use checked integer casts in builds with overflow checks, e.g.

pub fn cast(val: usize)->u16 {
    if cfg!(overflow_checks) {
        val.try_into().unwrap()
    }
    else{
        vas as _
    }
}

Resolves #91130.

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