プログラミングHaskellを写経してたらエラーが出た。
調べてみると n + k パターンはHaskell2010で廃止されたとのこと。
Haskell
pred :: Int -> Int
pred 0 = 0
pred (n + 1) = n -- => Parse error in pattern: n + 1
More than 5 years have passed since last update.
Register as a new user and use Qiita more conveniently
- You get articles that match your needs
- You can efficiently read back useful information
- You can use dark theme
List of users who liked
41