error[E0119]: conflicting implementations of trait `MyTrait` for type `lib::MyFundamentalStruct<(MyType,)>`:
  --> $DIR/coherence_copy_like_err_fundamental_struct_tuple.rs:19:1
   |
LL | impl<T: lib::MyCopy> MyTrait for T { }
   | ---------------------------------- first implementation here
...
LL | impl MyTrait for lib::MyFundamentalStruct<(MyType,)> { }
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `lib::MyFundamentalStruct<(MyType,)>`
   |
   = note: upstream crates may add a new impl of trait `lib::MyCopy` for type `lib::MyFundamentalStruct<(MyType,)>` in future versions

error: aborting due to previous error

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