2 fn main() { let _ = g(Some(E::F(K))); }
4 type R = Result<(), ()>;
8 F(K), // must not be built-in type
13 fn translate(x: R) -> R { x }
15 fn g(mut status: Option<E>) -> R {
18 Some(infix_or_postfix) => match infix_or_postfix {
19 E::F(_op) => { // <- must be captured by value
21 Err(err) => return Err(err),
27 _ => match translate(Err(())) {
28 Err(err) => return Err(err),