Custom errors for validators

[anti-social]

No description provided.

[tailhook]

Why custom_error. I think it's custom everywhere in the rust ecosystem?

[anti-social]

Because of implementing custom at impl ::serde::de::Error for Error:

error[E0277]: the trait bound `std::string::String: std::error::Error` is not satisfied                   
  --> src/de.rs:73:28                                                                                     
   |                                                 
73 |                 return Err(Error::custom(format!("bad boolean {:?}", self.0)));                      
   |                            ^^^^^^^^^^^^^ the trait `std::error::Error` is not implemented for `std::string::String`                                                                                            
   |                                                                                                      
   = note: required by `errors::Error::custom`

[tailhook]

You can write it as de::Error::custom instead. Presumably, this will never happen outside of the quire library itself (i.e. having de::Error in scope as well as quire::Error)

[tailhook]

Otherwise looks fine.

[tailhook]

Thanks! v0.3.1 will be published as soon as travis finishes.