1error[E0119]: conflicting implementations of trait `cxx::memory::UniquePtrTarget` for type `here::C`
2  --> $DIR/unique_ptr_twice.rs:16:5
3   |
47  |     impl UniquePtr<C> {}
5   |     ----------------- first implementation here
6...
716 |     impl UniquePtr<C> {}
8   |     ^^^^^^^^^^^^^^^^^ conflicting implementation for `here::C`
9