error[E0046]: not all trait items implemented, missing: `foo`, `bar`, `baz`, `bat`
  --> $DIR/missing-assoc-fn.rs:14:1
   |
LL |     fn foo<T: TraitB<Item = A>>(_: T) -> Self;
   |     ------------------------------------------ `foo` from trait
LL |     fn bar<T>(_: T) -> Self;
   |     ------------------------ `bar` from trait
LL |     fn baz<T>(_: T) -> Self where T: TraitB, <T as TraitB>::Item: Copy;
   |     ------------------------------------------------------------------- `baz` from trait
LL |     fn bat<T: TraitB<Item: Copy>>(_: T) -> Self;
   |     -------------------------------------------- `bat` from trait
...
LL | impl TraitA<()> for S {
   | ^^^^^^^^^^^^^^^^^^^^^ missing `foo`, `bar`, `baz`, `bat` in implementation

error[E0046]: not all trait items implemented, missing: `from_iter`
  --> $DIR/missing-assoc-fn.rs:19:1
   |
LL | impl FromIterator<()> for X {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `from_iter` in implementation
   |
   = help: implement the missing item: `fn from_iter<T: IntoIterator<Item = ()>>(_: T) -> Self { todo!() }`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0046`.