error[E0277]: `*const Bar` cannot be shared between threads safely
  --> $DIR/recursive-requirements.rs:16:12
   |
LL |     let _: AssertSync<Foo> = unimplemented!();
   |            ^^^^^^^^^^^^^^^ `*const Bar` cannot be shared between threads safely
   |
   = help: within `Foo`, the trait `Sync` is not implemented for `*const Bar`, which is required by `Foo: Sync`
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<T: Sync>(PhantomData<T>);
   |                      ^^^^ 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<Foo> = unimplemented!();
   |            ^^^^^^^^^^^^^^^ `*const Foo` cannot be shared between threads safely
   |
   = help: within `Foo`, the trait `Sync` is not implemented for `*const Foo`, which is required by `Foo: Sync`
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<Bar>`
  --> $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<T: Sync>(PhantomData<T>);
   |                      ^^^^ required by this bound in `AssertSync`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0277`.