File: extern-wrong-value-type.rs

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rustc 1.87.0%2Bdfsg1-1
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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}`
}