error[E0277]: `*const u8` cannot be sent between threads safely --> $DIR/E0277-2.rs:16:15 | LL | is_send::(); | ^^^ `*const u8` cannot be sent between threads safely | = help: within `Foo`, the trait `Send` is not implemented for `*const u8` note: required because it appears within the type `Baz` --> $DIR/E0277-2.rs:9:8 | LL | struct Baz { | ^^^ note: required because it appears within the type `Bar` --> $DIR/E0277-2.rs:5:8 | LL | struct Bar { | ^^^ note: required because it appears within the type `Foo` --> $DIR/E0277-2.rs:1:8 | LL | struct Foo { | ^^^ note: required by a bound in `is_send` --> $DIR/E0277-2.rs:13:15 | LL | fn is_send() { } | ^^^^ required by this bound in `is_send` error: aborting due to previous error For more information about this error, try `rustc --explain E0277`.