error[E0574]: expected struct, variant or union type, found trait `Trait`
  --> $DIR/issue-18986.rs:8:9
   |
LL |         Trait { x: 42 } => ()
   |         ^^^^^ not a struct, variant or union type

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0574`.