error[E0277]: `*const Bar` cannot be shared between threads safely --> $DIR/recursive-requirements.rs:16:12 | LL | let _: AssertSync = unimplemented!(); | ^^^^^^^^^^^^^^^ `*const Bar` cannot be shared between threads safely | = help: within `Foo`, the trait `Sync` is not implemented for `*const Bar` note: required because it appears within the type `Foo` --> $DIR/recursive-requirements.rs:5:12 | LL | pub struct Foo { | ^^^ note: required by a bound in `AssertSync` --> $DIR/recursive-requirements.rs:3:22 | LL | struct AssertSync(PhantomData); | ^^^^ required by this bound in `AssertSync` error[E0277]: `*const Foo` cannot be shared between threads safely --> $DIR/recursive-requirements.rs:16:12 | LL | let _: AssertSync = unimplemented!(); | ^^^^^^^^^^^^^^^ `*const Foo` cannot be shared between threads safely | = help: within `Foo`, the trait `Sync` is not implemented for `*const Foo` note: required because it appears within the type `Bar` --> $DIR/recursive-requirements.rs:10:12 | LL | pub struct Bar { | ^^^ note: required because it appears within the type `PhantomData` --> $SRC_DIR/core/src/marker.rs:LL:COL note: required because it appears within the type `Foo` --> $DIR/recursive-requirements.rs:5:12 | LL | pub struct Foo { | ^^^ note: required by a bound in `AssertSync` --> $DIR/recursive-requirements.rs:3:22 | LL | struct AssertSync(PhantomData); | ^^^^ required by this bound in `AssertSync` error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0277`.