cbindgen-0.24.5/tests/rust/assoc_constant.rs

#[repr(C)]
struct Foo {}

impl Foo {
    pub const GA: i32 = 10;
    pub const BU: &'static str = "hello world";
    pub const ZO: f32 = 3.14;

    pub(crate) const DONT_EXPORT_CRATE: i32 = 20;
    const DONT_EXPORT_PRIV: i32 = 30;
}

#[no_mangle]
pub extern "C" fn root(x: Foo) { }