messageField :: Parser Field
messageField = Field <$> ss modifier
                     <*> ss type_
                     <*> ss identifier <* ss "="
                     <*> ss integerLit
                     <*> ss options <* ss ";"
messageField :: Parser Field
messageField = Field <$> ss modifier
                     <*> ss type_
                     <*> ss identifier <* ss "="
                     <*> ss integerLit
                     <*> ss options <* ss ";"
messageField = Field <$> ss modifier
                     <*> ss type_
                     <*> ss identifier <* ss "="
                     <*> ss integerLit
                     <*> ss options <* ss ";"