Goals

Works like the ?-Operator but collect multiple errors before returning

fn get(input: Json) -> Result<Parsed, ErrorList<ErrorType>> {
  
  let (someAttribute, key) = multi_error!( input.get("someAttribute"), input.get("key") )?;
  let parsed = Parsed {
    someAttribute: someAttributeValue,
    key: value,
    input: input,
  };
}