diff options
Diffstat (limited to 'src/test/ui/structs-enums/tag-align-dyn-u64.rs')
-rw-r--r-- | src/test/ui/structs-enums/tag-align-dyn-u64.rs | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/src/test/ui/structs-enums/tag-align-dyn-u64.rs b/src/test/ui/structs-enums/tag-align-dyn-u64.rs new file mode 100644 index 000000000..3f7a5e3e5 --- /dev/null +++ b/src/test/ui/structs-enums/tag-align-dyn-u64.rs @@ -0,0 +1,29 @@ +// run-pass +#![allow(dead_code)] +#![allow(deprecated)] + +use std::mem; + +enum Tag<A> { + Tag2(A) +} + +struct Rec { + c8: u8, + t: Tag<u64> +} + +fn mk_rec() -> Rec { + return Rec { c8:0, t:Tag::Tag2(0) }; +} + +fn is_u64_aligned(u: &Tag<u64>) -> bool { + let p: usize = unsafe { mem::transmute(u) }; + let u64_align = std::mem::min_align_of::<u64>(); + return (p & (u64_align - 1)) == 0; +} + +pub fn main() { + let x = mk_rec(); + assert!(is_u64_aligned(&x.t)); +} |