Rollup merge of #68976 - ecstatic-morse:const-non-zero, r=dtolnay
Make `num::NonZeroX::new` an unstable `const fn` cc #53718 These require `#[feature(const_if_match)]`, meaning they must remain unstable for the time being.
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e3315f6742
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@ -69,8 +69,9 @@ assert_eq!(size_of::<Option<core::num::", stringify!($Ty), ">>(), size_of::<", s
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/// Creates a non-zero if the given value is not zero.
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#[$stability]
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#[rustc_const_unstable(feature = "const_nonzero_int_methods", issue = "53718")]
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#[inline]
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pub fn new(n: $Int) -> Option<Self> {
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pub const fn new(n: $Int) -> Option<Self> {
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if n != 0 {
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// SAFETY: we just checked that there's no `0`
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Some(unsafe { Self(n) })
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@ -1,9 +1,18 @@
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// build-pass (FIXME(62277): could be check-pass?)
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// run-pass
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#![feature(const_nonzero_int_methods)]
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use std::num::NonZeroU8;
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const X: NonZeroU8 = unsafe { NonZeroU8::new_unchecked(5) };
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const Y: u8 = X.get();
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const ZERO: Option<NonZeroU8> = NonZeroU8::new(0);
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const ONE: Option<NonZeroU8> = NonZeroU8::new(1);
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fn main() {
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assert_eq!(Y, 5);
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assert!(ZERO.is_none());
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assert_eq!(ONE.unwrap().get(), 1);
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}
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