src/test/ui/try-on-option-diagnostics.rs

   1 #![feature(try_trait)]
   2 // edition:2018
   3 fn main() {}
   4
   5 fn a_function() -> u32 {
   6     let x: Option<u32> = None;
   7     x?; //~ ERROR the `?` operator
   8     22
   9 }
  10
  11 fn a_closure() -> u32 {
  12     let a_closure = || {
  13         let x: Option<u32> = None;
  14         x?; //~ ERROR the `?` operator
  15         22
  16     };
  17     a_closure()
  18 }
  19
  20 fn a_method() -> u32 {
  21     struct S;
  22
  23     impl S {
  24         fn a_method() {
  25             let x: Option<u32> = None;
  26             x?; //~ ERROR the `?` operator
  27         }
  28     }
  29
  30     S::a_method();
  31     22
  32 }
  33
  34 fn a_trait_method() -> u32 {
  35     struct S;
  36     trait T {
  37         fn a_trait_method() {
  38             let x: Option<u32> = None;
  39             x?; //~ ERROR the `?` operator
  40         }
  41     }
  42
  43     impl T for S { }
  44
  45     S::a_trait_method();
  46     22
  47 }