src/test/ui/generator/print/generator-print-verbose-2.stderr

   1 error[E0277]: `Cell<i32>` cannot be shared between threads safely
   2   --> $DIR/generator-print-verbose-2.rs:19:5
   3    |
   4 LL |     assert_send(|| {
   5    |     ^^^^^^^^^^^ `Cell<i32>` cannot be shared between threads safely
   6    |
   7    = help: the trait `Sync` is not implemented for `Cell<i32>`
   8    = note: required because of the requirements on the impl of `Send` for `&'_#4r Cell<i32>`
   9 note: required because it's used within this generator
  10   --> $DIR/generator-print-verbose-2.rs:19:17
  11    |
  12 LL |       assert_send(|| {
  13    |  _________________^
  14 LL | |
  15 LL | |         drop(&a);
  16 LL | |         yield;
  17 LL | |     });
  18    | |_____^
  19 note: required by a bound in `assert_send`
  20   --> $DIR/generator-print-verbose-2.rs:10:23
  21    |
  22 LL |     fn assert_send<T: Send>(_: T) {}
  23    |                       ^^^^ required by this bound in `assert_send`
  24
  25 error: generator cannot be shared between threads safely
  26   --> $DIR/generator-print-verbose-2.rs:12:5
  27    |
  28 LL |     assert_sync(|| {
  29    |     ^^^^^^^^^^^ generator is not `Sync`
  30    |
  31    = help: within `[main::{closure#0} upvar_tys=() {Cell<i32>, ()}]`, the trait `Sync` is not implemented for `Cell<i32>`
  32 note: generator is not `Sync` as this value is used across a yield
  33   --> $DIR/generator-print-verbose-2.rs:15:9
  34    |
  35 LL |         let a = Cell::new(2);
  36    |             - has type `Cell<i32>` which is not `Sync`
  37 LL |         yield;
  38    |         ^^^^^ yield occurs here, with `a` maybe used later
  39 LL |     });
  40    |     - `a` is later dropped here
  41 note: required by a bound in `assert_sync`
  42   --> $DIR/generator-print-verbose-2.rs:9:23
  43    |
  44 LL |     fn assert_sync<T: Sync>(_: T) {}
  45    |                       ^^^^ required by this bound in `assert_sync`
  46
  47 error: aborting due to 2 previous errors
  48
  49 For more information about this error, try `rustc --explain E0277`.