error: #[builder(entry = "<name>")] cannot be defaulted for 'fn hmm' and must be specified via annotation
 --> tests/buildstructor/fail/unknown_naming.rs:9:8
  |
9 |     fn hmm() -> Exchange {
  |        ^^^

error: #[builder(entry = "<name>")] cannot be defaulted for 'fn do_phone_call' and must be specified via annotation
  --> tests/buildstructor/fail/unknown_naming.rs:15:8
   |
15 |     fn do_phone_call(&self, _number: String) {}
   |        ^^^^^^^^^^^^^