error[E0308]: `?` operator has incompatible types
 --> test/binary/03-reply-data.rs:8:23
  |
8 |     let value: bool = reply.data()?;  // Wrong data type, should be i32
  |                       ^^^^^^^^^^^^^ expected `bool`, found `i32`
  |
  = note: `?` operator cannot convert from `i32` to `bool`