rust/src/test/run-make-fulldeps/extern-fn-mangle/test.rs

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#[no_mangle]
pub extern "C" fn foo() -> i32 { 3 }
#[no_mangle]
pub extern "C" fn bar() -> i32 { 5 }
#[link(name = "test", kind = "static")]
extern {
fn add() -> i32;
}
fn main() {
let back = unsafe { add() };
assert_eq!(8, back);
}