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  1. #![allow(unreachable_code)]
  2.  
  3.  
  4. fn main() {
  5.     println!("{:?}", {
  6.         foo() -> Result<(), ()> { let foo = vec![]; let idx: Result<usize, ()> = Err(()); vec[idx?]; Ok(()) } foo()
  7.     });
  8. }
  9.  
  10.  
  11. /* ~~~~=== stderr ===~~~~
  12.    Compiling playground v0.0.1 (/playground)
  13. error: expected one of `.`, `;`, `?`, `}`, or an operator, found `->`
  14.  --> src/main.rs:6:15
  15.   |
  16. 6 |         foo() -> Result<(), ()> { let foo = vec![]; let idx: Result<usize, ()> = Err(()); vec[idx?]; Ok(()) } foo()
  17.   |               ^^ expected one of `.`, `;`, `?`, `}`, or an operator here
  18.  
  19. error[E0425]: cannot find function `foo` in this scope
  20.  --> src/main.rs:6:9
  21.   |
  22. 6 |         foo() -> Result<(), ()> { let foo = vec![]; let idx: Result<usize, ()> = Err(()); vec[idx?]; Ok(()) } foo()
  23.   |         ^^^ not found in this scope
  24.  
  25. error: aborting due to 2 previous errors
  26.  
  27. For more information about this error, try `rustc --explain E0425`.
  28. error: Could not compile `playground`.
  29.  
  30. To learn more, run the command again with --verbose.
  31.  
  32. */
  33.  
  34. /* ~~~~=== stdout ===~~~~
  35.  
  36. */
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