error[E0624]: associated function `f` is private
  --> $DIR/private-method-inherited.rs:13:7
   |
LL |         fn f(self) {}
   |         ---------- private associated function defined here
...
LL |     x.f();
   |       ^ private associated function

error: aborting due to previous error

For more information about this error, try `rustc --explain E0624`.