| //! Check that `vtable_size` gets overridden by llvm backend even if there is no | |
| //! `rustc_intrinsic_must_be_overridden` attribute on this usage. | |
| #![feature(rustc_attrs)] | |
| //@run-pass | |
| #[rustc_intrinsic] | |
| pub unsafe fn vtable_size(_ptr: *const ()) -> usize { | |
| panic!(); | |
| } | |
| trait Trait {} | |
| impl Trait for () {} | |
| fn main() { | |
| let x: &dyn Trait = &(); | |
| unsafe { | |
| let (_data, vtable): (*const (), *const ()) = core::mem::transmute(x); | |
| assert_eq!(vtable_size(vtable), 0); | |
| } | |
| } |