diff options
Diffstat (limited to 'src/test/ui/extern/extern-types-pointer-cast.rs')
-rw-r--r-- | src/test/ui/extern/extern-types-pointer-cast.rs | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/test/ui/extern/extern-types-pointer-cast.rs b/src/test/ui/extern/extern-types-pointer-cast.rs new file mode 100644 index 000000000..de6955bfa --- /dev/null +++ b/src/test/ui/extern/extern-types-pointer-cast.rs @@ -0,0 +1,31 @@ +// run-pass +#![allow(dead_code)] +// Test that pointers to extern types can be cast from/to usize, +// despite being !Sized. +#![feature(extern_types)] + +extern "C" { + type A; +} + +struct Foo { + x: u8, + tail: A, +} + +struct Bar<T: ?Sized> { + x: u8, + tail: T, +} + +#[cfg(target_pointer_width = "32")] +const MAGIC: usize = 0xdeadbeef; +#[cfg(target_pointer_width = "64")] +const MAGIC: usize = 0x12345678deadbeef; + +fn main() { + assert_eq!((MAGIC as *const A) as usize, MAGIC); + assert_eq!((MAGIC as *const Foo) as usize, MAGIC); + assert_eq!((MAGIC as *const Bar<A>) as usize, MAGIC); + assert_eq!((MAGIC as *const Bar<Bar<A>>) as usize, MAGIC); +} |