error[E0433]: failed to resolve: `A` is a variant, not a module
  --> $DIR/assoc-fn-call-on-variant.rs:14:8
   |
LL |     E::A::f();
   |        ^ `A` is a variant, not a module
   |
help: there is an enum variant `E::A`; try using the variant's enum
   |
LL |     E::f();
   |     ~

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0433`.