library/backtrace/crates/dylib-dep/src/lib.rs


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#![allow(improper_ctypes_definitions)]

type Pos = (&'static str, u32);

macro_rules! pos {
    () => {
        (file!(), line!())
    };
}

#[no_mangle]
pub extern "C" fn foo(outer: Pos, inner: fn(Pos, Pos)) {
    inner(outer, pos!());
}