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#![feature(fn_traits)]
trait CallSingle<A, B> {
fn call(&self, a: A) -> B where Self: Sized, Self: Fn(A) -> B;
}
impl<A, B, F: Fn(A) -> B> CallSingle<A, B> for F {
fn call(&self, a: A) -> B {
<Self as Fn(A) -> B>::call(self, (a,))
//~^ ERROR associated item constraints are not allowed here
}
}
fn main() {}
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