2021-06-27 07:59:38 -05:00
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// revisions: mirunsafeck thirunsafeck
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// [thirunsafeck]compile-flags: -Z thir-unsafeck
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2018-12-30 12:20:53 -06:00
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#![feature(rustc_attrs)]
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2018-11-06 10:43:32 -06:00
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#[rustc_layout_scalar_valid_range_start(1)]
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#[repr(transparent)]
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pub(crate) struct NonZero<T>(pub(crate) T);
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fn main() {
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}
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const fn foo() -> NonZero<u32> {
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let mut x = unsafe { NonZero(1) };
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2020-09-17 12:32:07 -05:00
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let y = &mut x.0; //~ ERROR mutable references
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2018-11-06 10:43:32 -06:00
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//~^ ERROR mutation of layout constrained field is unsafe
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unsafe { NonZero(1) }
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}
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const fn bar() -> NonZero<u32> {
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let mut x = unsafe { NonZero(1) };
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2020-09-17 12:32:07 -05:00
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let y = unsafe { &mut x.0 }; //~ ERROR mutable references
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2018-11-06 10:43:32 -06:00
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unsafe { NonZero(1) }
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}
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2021-01-03 12:46:20 -06:00
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const fn boo() -> NonZero<u32> {
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let mut x = unsafe { NonZero(1) };
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unsafe { let y = &mut x.0; } //~ ERROR mutable references
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unsafe { NonZero(1) }
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}
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