src/test/ui/parser/trailing-question-in-macro-type.rs

   1 macro_rules! fn_expr {
   2     ($return_type:ty : $body:expr) => {
   3         (|| -> $return_type { $body })()
   4     };
   5     ($body:expr) => {
   6         (|| $body)()
   7     };
   8 }
   9
  10
  11 fn main() {
  12     fn_expr!{ o?.when(|&i| i > 0)?.when(|&i| i%2 == 0) };
  13     //~^ ERROR cannot find value `o` in this scope
  14 }