error[E0603]: tuple struct constructor `Test` is private
  --> tests/ui/bad_visibility_of_relation.rs:21:22
   |
9  |         struct Test(u32);
   |                     --- a constructor is private if any of the fields is private
...
21 |     let _ = datalog::Test(1);
   |                      ^^^^ private tuple struct constructor
   |
note: the tuple struct constructor `Test` is defined here
  --> tests/ui/bad_visibility_of_relation.rs:9:9
   |
9  |         struct Test(u32);
   |         ^^^^^^^^^^^^^^^^^
help: consider making the field publicly accessible
   |
9  |         struct Test(pub u32);
   |                     +++

error[E0603]: tuple struct constructor `MoreTest` is private
  --> tests/ui/bad_visibility_of_relation.rs:22:22
   |
12 |         pub struct MoreTest(bool);
   |                             ---- a constructor is private if any of the fields is private
...
22 |     let _ = datalog::MoreTest(false);
   |                      ^^^^^^^^ private tuple struct constructor
   |
note: the tuple struct constructor `MoreTest` is defined here
  --> tests/ui/bad_visibility_of_relation.rs:12:9
   |
12 |         pub struct MoreTest(bool);
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
help: consider making the field publicly accessible
   |
12 |         pub struct MoreTest(pub bool);
   |                             +++