1 error[E0277]: `Rc<i8>` cannot be sent between threads safely
2 --> $DIR/builtin-superkinds-simple.rs:6:6
4 LL | impl Foo for std::rc::Rc<i8> { }
5 | ^^^ `Rc<i8>` cannot be sent between threads safely
7 = help: the trait `Send` is not implemented for `Rc<i8>`
8 note: required by a bound in `Foo`
9 --> $DIR/builtin-superkinds-simple.rs:4:13
11 LL | trait Foo : Send { }
12 | ^^^^ required by this bound in `Foo`
14 error: aborting due to previous error
16 For more information about this error, try `rustc --explain E0277`.