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extern "C" fn f() {
}
fn is_fn<F>(_: F) where F: Fn() {}
fn main() {
// extern functions are extern "C" fn
let _x: extern "C" fn() = f; // OK
is_fn(f);
//~^ ERROR expected a `Fn<()>` closure, found `extern "C" fn() {f}`
}
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