error[E0616]: field `c_object` of struct `Item` is private
  --> $DIR/issue-25386.rs:19:16
   |
LL |         (*$var.c_object).$member.is_some()
   |                ^^^^^^^^ private field
...
LL |     println!("{}", check_ptr_exist!(item, name));
   |                    ---------------------------- in this macro invocation
   |
   = note: this error originates in the macro `check_ptr_exist` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0616`.