1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
enum Ty { Unit, List(Box<Ty>), } fn foo(x: Ty) -> Ty { match x { Ty::Unit => Ty::Unit, Ty::List(elem) => foo(elem), //~^ ERROR mismatched types //~| HELP consider unboxing the value //~| HELP try wrapping } } fn main() {}