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error[E0277]: `std::rc::Rc<()>` cannot be sent between threads safely
--> $DIR/issue-21763.rs:9:5
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LL | fn foo<T: Send>() {}
| ---- required by this bound in `foo`
...
LL | foo::<HashMap<Rc<()>, Rc<()>>>();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `std::rc::Rc<()>` cannot be sent between threads safely
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= help: within `(std::rc::Rc<()>, std::rc::Rc<()>)`, the trait `std::marker::Send` is not implemented for `std::rc::Rc<()>`
= note: required because it appears within the type `(std::rc::Rc<()>, std::rc::Rc<()>)`
= note: required because of the requirements on the impl of `std::marker::Send` for `hashbrown::raw::RawTable<(std::rc::Rc<()>, std::rc::Rc<()>)>`
= note: required because it appears within the type `hashbrown::map::HashMap<std::rc::Rc<()>, std::rc::Rc<()>, std::collections::hash_map::RandomState>`
= note: required because it appears within the type `std::collections::HashMap<std::rc::Rc<()>, std::rc::Rc<()>>`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.
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