New upstream version 1.48.0~beta.8+dfsg1

[rustc.git] / src / test / ui / consts / const-eval / double_check2.rs

// check-pass

// This test exhibits undefined behavior, but it is very expensive and complex to check for such
// UB in constants.
// Thus, we do not detect it if you create references to statics in ways that are UB.

enum Foo {
    A = 5,
    B = 42,
}
enum Bar {
    C = 42,
    D = 99,
}
#[repr(C)]
union Union {
    foo: &'static Foo,
    bar: &'static Bar,
    u8: &'static u8,
}
static BAR: u8 = 5;
static FOO: (&Foo, &Bar) = unsafe {
    (
        // undefined behavior
        Union { u8: &BAR }.foo,
        Union { u8: &BAR }.bar,
    )
};
static FOO2: (&Foo, &Bar) = unsafe { (std::mem::transmute(&BAR), std::mem::transmute(&BAR)) };
//^ undefined behavior

fn main() {}