File: non-tupled-arg-mismatch.rs

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rustc 1.86.0%2Bdfsg1-1
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#![feature(unboxed_closures)]

fn a<F: Fn<usize>>(f: F) {}
//~^ ERROR type parameter to bare `Fn` trait must be a tuple

fn main() {
    a(|_: usize| {}); //~ ERROR: mismatched types
}