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