error[E0119]: conflicting implementations of trait `<CharacterValue as juniper::GraphQLInterface<__S>>::mark::_::{closure#0}::MutuallyExclusive` for type `ObjA`
  --> $DIR/implementers_duplicate_ugly.rs:18:1
   |
18 | #[graphql_interface(for = [ObjA, ObjAlias])]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   | |
   | first implementation here
   | conflicting implementation for `ObjA`
   |
   = note: this error originates in the macro `::juniper::sa::assert_type_ne_all` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0119]: conflicting implementations of trait `std::convert::From<ObjA>` for type `CharacterValue`
  --> $DIR/implementers_duplicate_ugly.rs:18:1
   |
18 | #[graphql_interface(for = [ObjA, ObjAlias])]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   | |
   | first implementation here
   | conflicting implementation for `CharacterValue`
   |
   = note: this error originates in the attribute macro `graphql_interface` (in Nightly builds, run with -Z macro-backtrace for more info)