mirror of https://github.com/rust-lang/rust
23 lines
523 B
Rust
23 lines
523 B
Rust
#![feature(rustc_attrs)]
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#![allow(unused,dead_code)]
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fn nested_field() {
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#[rustc_layout_scalar_valid_range_start(1)]
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struct NonZero<T>(T);
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let mut foo = unsafe { NonZero((1,)) };
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foo.0.0 = 0;
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//~^ ERROR: mutation of layout constrained field is unsafe
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}
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fn block() {
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#[rustc_layout_scalar_valid_range_start(1)]
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struct NonZero<T>(T);
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let mut foo = unsafe { NonZero((1,)) };
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{ foo.0 }.0 = 0;
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// ^ not unsafe because the result of the block expression is a new place
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}
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fn main() {}
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