mirror of https://github.com/rust-lang/rust
83 lines
1.8 KiB
Rust
83 lines
1.8 KiB
Rust
//@ run-pass
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#![allow(stable_features)]
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#![feature(core, core_intrinsics)]
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extern crate core;
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use core::intrinsics::discriminant_value;
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enum CLike1 {
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A,
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B,
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C,
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D
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}
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enum CLike2 {
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A = 5,
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B = 2,
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C = 19,
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D
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}
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#[repr(i8)]
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enum CLike3 {
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A = 5,
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B,
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C = -1,
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D
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}
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#[allow(dead_code)]
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enum ADT {
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First(u32, u32),
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Second(u64)
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}
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enum NullablePointer {
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Something(#[allow(dead_code)] &'static u32),
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Nothing
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}
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static CONST : u32 = 0xBEEF;
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#[allow(dead_code)]
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#[repr(isize)]
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enum Mixed {
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Unit = 3,
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Tuple(u16) = 2,
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Struct {
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a: u8,
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b: u16,
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} = 1,
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}
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pub fn main() {
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assert_eq!(discriminant_value(&CLike1::A), 0isize);
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assert_eq!(discriminant_value(&CLike1::B), 1);
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assert_eq!(discriminant_value(&CLike1::C), 2);
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assert_eq!(discriminant_value(&CLike1::D), 3);
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assert_eq!(discriminant_value(&CLike2::A), 5isize);
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assert_eq!(discriminant_value(&CLike2::B), 2);
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assert_eq!(discriminant_value(&CLike2::C), 19);
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assert_eq!(discriminant_value(&CLike2::D), 20);
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assert_eq!(discriminant_value(&CLike3::A), 5i8);
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assert_eq!(discriminant_value(&CLike3::B), 6);
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assert_eq!(discriminant_value(&CLike3::C), -1);
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assert_eq!(discriminant_value(&CLike3::D), 0);
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assert_eq!(discriminant_value(&ADT::First(0,0)), 0isize);
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assert_eq!(discriminant_value(&ADT::Second(5)), 1);
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assert_eq!(discriminant_value(&NullablePointer::Nothing), 1isize);
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assert_eq!(discriminant_value(&NullablePointer::Something(&CONST)), 0);
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assert_eq!(discriminant_value(&10), 0u8);
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assert_eq!(discriminant_value(&"test"), 0u8);
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assert_eq!(discriminant_value(&Mixed::Unit), 3isize);
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assert_eq!(discriminant_value(&Mixed::Tuple(5)), 2);
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assert_eq!(discriminant_value(&Mixed::Struct{a: 7, b: 11}), 1);
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}
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