tests/ui/layout/enum.rs

//@ normalize-stderr: "pref: Align\([1-8] bytes\)" -> "pref: $$PREF_ALIGN"
//! Various enum layout tests.

#![feature(rustc_attrs)]
#![feature(never_type)]
#![crate_type = "lib"]

#[rustc_dump_layout(align)]
enum UninhabitedVariantAlign { //~ERROR: align: Align(2 bytes)
    A([u8; 32]),
    B([u16; 0], !), // make sure alignment in uninhabited fields is respected
}

#[rustc_dump_layout(size)]
enum UninhabitedVariantSpace { //~ERROR: size: Size(16 bytes)
    A,
    B([u8; 15], !), // make sure there is space being reserved for this field.
}

#[rustc_dump_layout(backend_repr)]
enum ScalarPairDifferingSign { //~ERROR: backend_repr: ScalarPair
    A(u8),
    B(i8),
}

enum Never {}

// See https://github.com/rust-lang/rust/issues/146984
#[rustc_dump_layout(size)]
#[repr(u32)]
enum DefinedLayoutAllUninhabited { //~ERROR: size: Size(4 bytes)
    A(Never),
    B(Never),
}