src/librustc_error_codes/error_codes/E0727.md

   1 A `yield` clause was used in an `async` context.
   2
   3 Example of erroneous code:
   4
   5 ```compile_fail,E0727,edition2018
   6 #![feature(generators)]
   7
   8 fn main() {
   9     let generator = || {
  10         async {
  11             yield;
  12         }
  13     };
  14 }
  15 ```
  16
  17 Here, the `yield` keyword is used in an `async` block,
  18 which is not yet supported.
  19
  20 To fix this error, you have to move `yield` out of the `async` block:
  21
  22 ```edition2018
  23 #![feature(generators)]
  24
  25 fn main() {
  26     let generator = || {
  27         yield;
  28     };
  29 }
  30 ```