mirror of https://github.com/rust-lang/rust
55 lines
1.4 KiB
Rust
55 lines
1.4 KiB
Rust
//@ normalize-stderr-test "pref: Align\([1-8] bytes\)" -> "pref: $$PREF_ALIGN"
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#![crate_type = "lib"]
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#![feature(rustc_attrs)]
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use std::mem::MaybeUninit;
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enum HasNiche {
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A,
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B,
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C,
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}
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// This should result in ScalarPair(Initialized, Union),
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// since the u8 payload will be uninit for `None`.
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#[rustc_layout(debug)]
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pub enum MissingPayloadField { //~ ERROR: layout_of
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Some(u8),
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None
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}
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// This should result in ScalarPair(Initialized, Initialized),
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// since the u8 field is present in all variants,
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// and hence will always be initialized.
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#[rustc_layout(debug)]
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pub enum CommonPayloadField { //~ ERROR: layout_of
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A(u8),
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B(u8),
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}
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// This should result in ScalarPair(Initialized, Union),
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// since, though a u8-sized field is present in all variants, it might be uninit.
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#[rustc_layout(debug)]
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pub enum CommonPayloadFieldIsMaybeUninit { //~ ERROR: layout_of
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A(u8),
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B(MaybeUninit<u8>),
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}
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// This should result in ScalarPair(Initialized, Union),
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// since only the niche field (used for the tag) is guaranteed to be initialized.
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#[rustc_layout(debug)]
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pub enum NicheFirst { //~ ERROR: layout_of
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A(HasNiche, u8),
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B,
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C
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}
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// This should result in ScalarPair(Union, Initialized),
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// since only the niche field (used for the tag) is guaranteed to be initialized.
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#[rustc_layout(debug)]
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pub enum NicheSecond { //~ ERROR: layout_of
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A(u8, HasNiche),
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B,
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C,
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}
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