error[E0603]: struct `Flags2` is private
  --> $DIR/private_flags.rs:17:26
   |
17 |     let flag2 = example::Flags2::FLAG_B;
   |                          ^^^^^^ private struct
   |
note: the struct `Flags2` is defined here
  --> $DIR/private_flags.rs:4:5
   |
4  | /     bitflags! {
5  | |         pub struct Flags1: u32 {
6  | |             const FLAG_A = 0b00000001;
7  | |         }
...  |
11 | |         }
12 | |     }
   | |_____^
   = note: this error originates in the macro `bitflags` (in Nightly builds, run with -Z macro-backtrace for more info)