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error[E0277]: `Rc<RefCell<A>>` cannot be sent between threads safely
--> $DIR/issue-7013.rs:24:19
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LL | let a = A {v: Box::new(B{v: None}) as Box<dyn Foo + Send>};
| ^^^^^^^^^^^^^^^^^^^^ `Rc<RefCell<A>>` cannot be sent between threads safely
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= help: within `B`, the trait `Send` is not implemented for `Rc<RefCell<A>>`
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
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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`.
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