error[E0532]: expected tuple struct/variant, found struct variant `FooB`
  --> $DIR/issue-19086.rs:10:9
   |
LL |         FooB(a, b) => println!("{} {}", a, b),
   |         ^^^^ did you mean `FooB { /* fields */ }`?

error: aborting due to previous error

For more information about this error, try `rustc --explain E0532`.