| error[E0277]: `Rc<RefCell<A>>` cannot be sent between threads safely |
| --> $DIR/issue-7013.rs:24:19 |
| | |
| LL | let a = A {v: Box::new(B{v: None}) as Box<dyn Foo + Send>}; |
| | ^^^^^^^^^^^^^^^^^^^^ `Rc<RefCell<A>>` cannot be sent between threads safely |
| | |
| = help: within `B`, the trait `Send` is not implemented for `Rc<RefCell<A>>`, which is required by `B: Send` |
| note: required because it appears within the type `Option<Rc<RefCell<A>>>` |
| --> $SRC_DIR/core/src/option.rs:LL:COL |
| note: required because it appears within the type `B` |
| --> $DIR/issue-7013.rs:8:8 |
| | |
| LL | struct B { |
| | ^ |
| = note: required for the cast from `Box<B>` to `Box<dyn Foo + Send>` |
| |
| error: aborting due to 1 previous error |
| |
| For more information about this error, try `rustc --explain E0277`. |
