src/test/ui/issues/issue-17431-4.stderr

   1 error[E0072]: recursive type `Foo` has infinite size
   2   --> $DIR/issue-17431-4.rs:3:1
   3    |
   4 LL | struct Foo<T> { foo: Option<Option<Foo<T>>>, marker: marker::PhantomData<T> }
   5    | ^^^^^^^^^^^^^                      ------ recursive without indirection
   6    |
   7 help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to break the cycle
   8    |
   9 LL | struct Foo<T> { foo: Option<Option<Box<Foo<T>>>>, marker: marker::PhantomData<T> }
  10    |                                    ++++      +
  11
  12 error: aborting due to previous error
  13
  14 For more information about this error, try `rustc --explain E0072`.