3 trait CallSingle<A, B> {
4 fn call(&self, a: A) -> B where Self: Sized, Self: Fn(A) -> B;
7 impl<A, B, F: Fn(A) -> B> CallSingle<A, B> for F {
8 fn call(&self, a: A) -> B {
9 <Self as Fn(A) -> B>::call(self, (a,))
10 //~^ ERROR associated type bindings are not allowed here