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error[E0277]: `Rc<()>` cannot be sent between threads safely
--> $DIR/issue-21763.rs:9:5
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LL | foo::<HashMap<Rc<()>, Rc<()>>>();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `Rc<()>` cannot be sent between threads safely
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= help: within `(Rc<()>, Rc<()>)`, the trait `Send` is not implemented for `Rc<()>`
= note: required because it appears within the type `(Rc<()>, Rc<()>)`
= note: required because of the requirements on the impl of `Send` for `hashbrown::raw::RawTable<(Rc<()>, Rc<()>)>`
= note: required because it appears within the type `hashbrown::map::HashMap<Rc<()>, Rc<()>, RandomState>`
= note: required because it appears within the type `HashMap<Rc<()>, Rc<()>>`
note: required by a bound in `foo`
--> $DIR/issue-21763.rs:6:11
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LL | fn foo<T: Send>() {}
| ^^^^ required by this bound in `foo`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.
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