diff options
Diffstat (limited to 'src/test/ui/repr/repr_c_int_align.rs')
-rw-r--r-- | src/test/ui/repr/repr_c_int_align.rs | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/src/test/ui/repr/repr_c_int_align.rs b/src/test/ui/repr/repr_c_int_align.rs new file mode 100644 index 000000000..fdd14fc2d --- /dev/null +++ b/src/test/ui/repr/repr_c_int_align.rs @@ -0,0 +1,46 @@ +// run-pass +// compile-flags: -O + +#![allow(dead_code)] + +#[repr(C, u8)] +enum ReprCu8 { + A(u16), + B, +} + +#[repr(u8)] +enum Repru8 { + A(u16), + B, +} + +#[repr(C)] +struct ReprC { + tag: u8, + padding: u8, + payload: u16, +} + +fn main() { + // Test `repr(C, u8)`. + let r1 = ReprC { tag: 0, padding: 0, payload: 0 }; + let r2 = ReprC { tag: 0, padding: 1, payload: 1 }; + + let t1: &ReprCu8 = unsafe { std::mem::transmute(&r1) }; + let t2: &ReprCu8 = unsafe { std::mem::transmute(&r2) }; + + match (t1, t2) { + (ReprCu8::A(_), ReprCu8::A(_)) => (), + _ => assert!(false) + }; + + // Test `repr(u8)`. + let t1: &Repru8 = unsafe { std::mem::transmute(&r1) }; + let t2: &Repru8 = unsafe { std::mem::transmute(&r2) }; + + match (t1, t2) { + (Repru8::A(_), Repru8::A(_)) => (), + _ => assert!(false) + }; +} |