src/test/run-pass/diverging-fallback-method-chain.rs

   1 #![allow(unused_imports)]
   2 // Test a regression found when building compiler. The `produce()`
   3 // error type `T` winds up getting unified with result of `x.parse()`;
   4 // the type of the closure given to `unwrap_or_else` needs to be
   5 // inferred to `usize`.
   6
   7 use std::num::ParseIntError;
   8
   9 fn produce<T>() -> Result<&'static str, T> {
  10     Ok("22")
  11 }
  12
  13 fn main() {
  14     let x: usize = produce()
  15         .and_then(|x| x.parse())
  16         .unwrap_or_else(|_| panic!());
  17     println!("{}", x);
  18 }