tests/ui/traits/object/extern-c-trait-object-methods.rs

//! Regression test for <https://github.com/rust-lang/rust/issues/51907>.
//! Test extern `C` trait object methods don't ICE.
//@ run-pass

trait Foo {
    extern "C" fn borrow(&self);
    extern "C" fn take(self: Box<Self>);
}

struct Bar;
impl Foo for Bar {
    #[allow(improper_ctypes_definitions)]
    extern "C" fn borrow(&self) {}
    #[allow(improper_ctypes_definitions)]
    extern "C" fn take(self: Box<Self>) {}
}

fn main() {
    let foo: Box<dyn Foo> = Box::new(Bar);
    foo.borrow();
    foo.take()
}