error[E0603]: struct `Struct` is private
  --> tests/ui/reject/builder_priv.rs:12:17
   |
12 |     let _ = other::Struct::builder();
   |                    ^^^^^^ private struct
   |
note: the struct `Struct` is defined here
  --> tests/ui/reject/builder_priv.rs:5:2
   |
5  |     struct Struct {
   |     ^^^^^^^^^^^^^