1error[E0119]: conflicting implementations of trait `std::marker::Unpin` for type `Struct<_>`:
2  --> $DIR/marker_trait_attr.rs:12:1
3   |
412 | #[pin_project] //~ ERROR E0119
5   | ^^^^^^^^^^^^^^ conflicting implementation for `Struct<_>`
6...
719 | impl<T> Unpin for Struct<T> {}
8   | --------------------------- first implementation here
9   |
10   = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)
11