1 error[E0277]: `Rc<u32>` cannot be sent between threads safely
2 --> $DIR/auto-trait-leakage2.rs:21:13
4 LL | type Foo = impl std::fmt::Debug;
5 | -------------------- within this `Foo`
7 LL | is_send(m::foo());
8 | ------- ^^^^^^^^ `Rc<u32>` cannot be sent between threads safely
10 | required by a bound introduced by this call
12 = help: within `Foo`, the trait `Send` is not implemented for `Rc<u32>`
13 note: required because it appears within the type `Foo`
14 --> $DIR/auto-trait-leakage2.rs:7:16
16 LL | type Foo = impl std::fmt::Debug;
17 | ^^^^^^^^^^^^^^^^^^^^
18 note: required by a bound in `is_send`
19 --> $DIR/auto-trait-leakage2.rs:16:15
21 LL | fn is_send<T: Send>(_: T) {}
22 | ^^^^ required by this bound in `is_send`
24 error: aborting due to previous error
26 For more information about this error, try `rustc --explain E0277`.