src/test/ui/issues/issue-16668.rs

   1 // check-pass
   2 #![allow(dead_code)]
   3 struct Parser<'a, I, O> {
   4     parse: Box<dyn FnMut(I) -> Result<O, String> + 'a>
   5 }
   6
   7 impl<'a, I: 'a, O: 'a> Parser<'a, I, O> {
   8     fn compose<K: 'a>(mut self, mut rhs: Parser<'a, O, K>) -> Parser<'a, I, K> {
   9         Parser {
  10             parse: Box::new(move |x: I| {
  11                 match (self.parse)(x) {
  12                     Ok(r) => (rhs.parse)(r),
  13                     Err(e) => Err(e)
  14                 }
  15             })
  16         }
  17     }
  18 }
  19
  20 fn main() {}