error: Expected a named field
 --> tests/fail/positional.rs:4:19
  |
4 | struct Positional(usize, bool, String);
  |                   ^^^^^

error: Expected a named field
 --> tests/fail/positional.rs:4:26
  |
4 | struct Positional(usize, bool, String);
  |                          ^^^^

error: Expected a named field
 --> tests/fail/positional.rs:4:32
  |
4 | struct Positional(usize, bool, String);
  |                                ^^^^^^