error[E0277]: `Foo` cannot be shared between threads safely --> $DIR/no_share-struct.rs:12:9 | LL | bar(x); | --- ^ `Foo` cannot be shared between threads safely | | | required by a bound introduced by this call | = help: the trait `Sync` is not implemented for `Foo` note: required by a bound in `bar` --> $DIR/no_share-struct.rs:8:11 | LL | fn bar(_: T) {} | ^^^^ required by this bound in `bar` error: aborting due to previous error For more information about this error, try `rustc --explain E0277`.