author | huffman |
Sun, 07 Mar 2010 16:12:01 -0800 | |
changeset 35641 | a17bc4cec23a |
parent 30226 | 2f4684e2ea95 |
permissions | -rw-r--r-- |
module Codegen where { import qualified Nat; class Null a where { nulla :: a; }; heada :: forall a. (Codegen.Null a) => [a] -> a; heada (x : xs) = x; heada [] = Codegen.nulla; null_option :: forall a. Maybe a; null_option = Nothing; instance Codegen.Null (Maybe a) where { nulla = Codegen.null_option; }; dummy :: Maybe Nat.Nat; dummy = Codegen.heada [Just (Nat.Suc Nat.Zero_nat), Nothing]; }