1 error[E0059]: cannot use call notation; the first type parameter for the function trait is neither a tuple nor unit
2 --> $DIR/overloaded-calls-nontuple.rs:36:10
4 LL | drop(s(3)) //~ ERROR cannot use call notation
7 error: aborting due to previous error
9 For more information about this error, try `rustc --explain E0059`.