mirror of https://github.com/rust-lang/rust
27 lines
689 B
Rust
27 lines
689 B
Rust
#![feature(rustc_attrs)]
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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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let y = &mut x.0; //~ ERROR mutable references
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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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let y = unsafe { &mut x.0 }; //~ ERROR mutable references
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unsafe { NonZero(1) }
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}
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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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