tests/ui/generator/print/generator-print-verbose-1.drop_tracking.stderr

   1 error: generator cannot be sent between threads safely
   2   --> $DIR/generator-print-verbose-1.rs:40:18
   3    |
   4 LL |     require_send(send_gen);
   5    |                  ^^^^^^^^ generator is not `Send`
   6    |
   7    = help: the trait `Sync` is not implemented for `RefCell<i32>`
   8    = note: if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock` instead
   9 note: generator is not `Send` as this value is used across a yield
  10   --> $DIR/generator-print-verbose-1.rs:38:9
  11    |
  12 LL |         let _non_send_gen = make_non_send_generator();
  13    |             ------------- has type `Opaque(DefId(0:34 ~ generator_print_verbose_1[749a]::make_non_send_generator::{opaque#0}), [])` which is not `Send`
  14 LL |         yield;
  15    |         ^^^^^ yield occurs here, with `_non_send_gen` maybe used later
  16 LL |     };
  17    |     - `_non_send_gen` is later dropped here
  18 note: required by a bound in `require_send`
  19   --> $DIR/generator-print-verbose-1.rs:29:25
  20    |
  21 LL | fn require_send(_: impl Send) {}
  22    |                         ^^^^ required by this bound in `require_send`
  23
  24 error[E0277]: `RefCell<i32>` cannot be shared between threads safely
  25   --> $DIR/generator-print-verbose-1.rs:59:18
  26    |
  27 LL |     require_send(send_gen);
  28    |     ------------ ^^^^^^^^ `RefCell<i32>` cannot be shared between threads safely
  29    |     |
  30    |     required by a bound introduced by this call
  31    |
  32    = help: the trait `Sync` is not implemented for `RefCell<i32>`
  33    = note: if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock` instead
  34    = note: required for `Arc<RefCell<i32>>` to implement `Send`
  35 note: required because it's used within this generator
  36   --> $DIR/generator-print-verbose-1.rs:45:5
  37    |
  38 LL |     || {
  39    |     ^^
  40 note: required because it appears within the type `Opaque(DefId(0:35 ~ generator_print_verbose_1[749a]::make_gen2::{opaque#0}), [Arc<RefCell<i32>>])`
  41   --> $DIR/generator-print-verbose-1.rs:44:30
  42    |
  43 LL | pub fn make_gen2<T>(t: T) -> impl Generator<Return = T> {
  44    |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^
  45 note: required because it appears within the type `Opaque(DefId(0:36 ~ generator_print_verbose_1[749a]::make_non_send_generator2::{opaque#0}), [])`
  46   --> $DIR/generator-print-verbose-1.rs:50:34
  47    |
  48 LL | fn make_non_send_generator2() -> impl Generator<Return = Arc<RefCell<i32>>> {
  49    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  50    = note: required because it captures the following types: `Opaque(DefId(0:36 ~ generator_print_verbose_1[749a]::make_non_send_generator2::{opaque#0}), [])`, `()`
  51 note: required because it's used within this generator
  52   --> $DIR/generator-print-verbose-1.rs:55:20
  53    |
  54 LL |     let send_gen = || {
  55    |                    ^^
  56 note: required by a bound in `require_send`
  57   --> $DIR/generator-print-verbose-1.rs:29:25
  58    |
  59 LL | fn require_send(_: impl Send) {}
  60    |                         ^^^^ required by this bound in `require_send`
  61
  62 error: aborting due to 2 previous errors
  63
  64 For more information about this error, try `rustc --explain E0277`.