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struct Opaque();
#[repr(C)]
struct Foo {
x: Option<&Opaque>,
y: Option<&mut Opaque>,
z: Option<fn () -> ()>,
zz: *mut Option<fn () -> ()>,
}
#[repr(C)]
union Bar {
x: Option<&Opaque>,
y: Option<&mut Opaque>,
z: Option<fn () -> ()>,
zz: *mut Option<fn () -> ()>,
}
#[no_mangle]
pub extern "C" fn root(
a: Option<&Opaque>,
b: Option<&mut Opaque>,
c: Foo,
d: Bar,
e: *mut Option<*mut Opaque>,
f: extern "C" fn(Option<&Opaque>),
) { }
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