1 Jul
2021
1 Jul
'21
4:41 p.m.
I am using the built-in data type Day (Data.Time) in two ways data PDate = PDate Day or type PDate Day doesn't seem to matter. But then this doesn't work testrec1 = PDate 2021 7 1 I always must use the "helper function" fromGregorian testrec0 = PDate (fromGregorian 2021 7 1) ... PDate 2021-07-01 Looking at Real World Haskell examples data BookInfo = Book Int String [String] deriving (Show) ... myInfo = Book 9780135072455 "Algebra of Programming" ["Richard Bird", "Oege de Moor"] I know there's a great Haskell lesson to learn here, so why can Book take everything naked but my Day version not? ⨽ Lawrence Bottorff Grand Marais, MN, USA borgauf@gmail.com