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  1. #![allow(unreachable_code)]
  2.  
  3.  
  4. fn main() {
  5.     println!("{:?}", {
  6.         use std::convert::TryFrom; struct NewType<'a, T>(&'a Vec<T>); impl<'a, T> TryFrom<&'a Vec<T>> for NewType<'a, T> { type Error = (); fn try_from(vec: &'a Vec<T>) -> Result<NewType<'a, T>, ()> { Ok(NewType(vec)) } } fn check<T: TryInto<NewType<'_, T>>>(_: T); let vec: Vec<i32> = Vec::new(); check(&vec)
  7.     });
  8. }
  9.  
  10.  
  11. /* ~~~~=== stderr ===~~~~
  12.    Compiling playground v0.0.1 (/playground)
  13. error: expected one of `->`, `where`, or `{`, found `;`
  14.  --> src/main.rs:6:265
  15.   |
  16. 6 |         use std::convert::TryFrom; struct NewType<'a, T>(&'a Vec<T>); impl<'a, T> TryFrom<&'a Vec<T>> for NewType<'a, T> { type Error = (); fn try_from(vec: &'a Vec<T>) -> Result<NewType<'a, T>, ()> { Ok(NewType(vec)) } } fn check<T: TryInto<NewType<'_, T>>>(_: T); let vec: Vec<i32> = Vec::new(); check(&vec)
  17.   |                                                                                                                                                                                                                                                                         ^ expected one of `->`, `where`, or `{` here
  18.  
  19. error: aborting due to previous error
  20.  
  21. error: Could not compile `playground`.
  22.  
  23. To learn more, run the command again with --verbose.
  24.  
  25. */
  26.  
  27. /* ~~~~=== stdout ===~~~~
  28.  
  29. */
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