1error[E0412]: cannot find type `__S` in this scope 2 --> $DIR/unpin_sneaky.rs:9:16 3 | 49 | impl Unpin for __S {} //~ ERROR E0412,E0321 5 | ^^^ not found in this scope 6 7error[E0321]: cross-crate traits with a default impl, like `Unpin`, can only be implemented for a struct/enum type, not `[type error]` 8 --> $DIR/unpin_sneaky.rs:9:1 9 | 109 | impl Unpin for __S {} //~ ERROR E0412,E0321 11 | ^^^^^^^^^^^^^^^^^^ can't implement cross-crate trait with a default impl for non-struct/enum type 12