rust/tests/ui/consts/const-enum-cast.rs
2023-01-11 09:32:08 +00:00

42 lines
963 B
Rust

// run-pass
#![allow(non_upper_case_globals)]
enum A { A1, A2 }
enum B { B1=4, B2=2 }
#[allow(dead_code)]
#[repr(align(8))]
enum Aligned {
Zero = 0,
One = 1,
}
// regression test for https://github.com/rust-lang/rust/issues/96185
const X: u8 = {
let aligned = Aligned::Zero;
aligned as u8
};
pub fn main () {
static c1: isize = A::A2 as isize;
static c2: isize = B::B2 as isize;
let a1 = A::A2 as isize;
let a2 = B::B2 as isize;
assert_eq!(c1, 1);
assert_eq!(c2, 2);
assert_eq!(a1, 1);
assert_eq!(a2, 2);
// Turns out that adding a let-binding generates totally different MIR.
static c1_2: isize = { let v = A::A1; v as isize };
static c2_2: isize = { let v = B::B1; v as isize };
let a1_2 = { let v = A::A1; v as isize };
let a2_2 = { let v = B::B1; v as isize };
assert_eq!(c1_2, 0);
assert_eq!(c2_2, 4);
assert_eq!(a1_2, 0);
assert_eq!(a2_2, 4);
assert_eq!(X, 0);
}