src/test/ui/async-await/issue-64130-2-send.rs

   1 #![feature(optin_builtin_traits)]
   2 // edition:2018
   3
   4 // This tests the the specialized async-await-specific error when futures don't implement an
   5 // auto trait (which is specifically Send) due to some type that was captured.
   6
   7 struct Foo;
   8
   9 impl !Send for Foo {}
  10
  11 fn is_send<T: Send>(t: T) { }
  12
  13 async fn bar() {
  14     let x = Foo;
  15     baz().await;
  16 }
  17
  18 async fn baz() { }
  19
  20 fn main() {
  21     is_send(bar());
  22     //~^ ERROR future cannot be sent between threads safely
  23 }