vlib/v/checker/tests/no_interface_instantiation_b.vv:3:10: notice: unused parameter: `s`
    1 | interface Speaker {}
    2 | 
    3 | fn my_fn(s Speaker) {}
      |          ^
    4 | 
    5 | fn main() {
vlib/v/checker/tests/no_interface_instantiation_b.vv:6:2: error: expected 1 argument, but got 0
    4 | 
    5 | fn main() {
    6 |     my_fn()
      |     ~~~~~~~
    7 | }
Details: have ()
         want (main.Speaker)