error[E0119]: conflicting implementations of trait `IntoPyDictPointer` for type `()`:
  --> $DIR/issue-52050.rs:28:1
   |
LL | / impl<I> IntoPyDictPointer for I
LL | | where
LL | |     I: Iterator,
LL | | {
LL | | }
   | |_- first implementation here
LL | 
LL |   impl IntoPyDictPointer for () //~ ERROR conflicting implementations
   |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `()`
   |
   = note: upstream crates may add new impl of trait `std::iter::Iterator` for type `()` in future versions

error: aborting due to previous error

For more information about this error, try `rustc --explain E0119`.