| //@ run-pass |
| // #11303, #11040: |
| // This would previously crash on i686 Linux due to abi differences |
| // between returning an Option<T> and T, where T is a non nullable |
| // pointer. |
| // If we have an enum with two variants such that one is zero sized |
| // and the other contains a nonnullable pointer, we don't use a |
| // separate discriminant. Instead we use that pointer field to differentiate |
| // between the 2 cases. |
| // Also, if the variant with the nonnullable pointer has no other fields |
| // then we simply express the enum as just a pointer and not wrap it |
| // in a struct. |
| |
| |
| use std::mem; |
| |
| #[inline(never)] |
| extern "C" fn foo(x: &isize) -> Option<&isize> { Some(x) } |
| |
| static FOO: isize = 0xDEADBEE; |
| |
| pub fn main() { |
| unsafe { |
| let f: extern "C" fn(&isize) -> &isize = |
| mem::transmute(foo as extern "C" fn(&isize) -> Option<&isize>); |
| assert_eq!(*f(&FOO), FOO); |
| } |
| } |
