builder error: redefinition of function `f`
vlib/v/checker/tests/fn_duplicate.vv:1:1: conflicting declaration: fn f()
    1 | fn f() {
      | ~~~~~~
    2 | }
    3 |
vlib/v/checker/tests/fn_duplicate.vv:4:1: conflicting declaration: fn f(i int)
    2 | }
    3 |
    4 | fn f(i int) {
      | ~~~~~~~~~~~
    5 | }
