在GHC中，有沒有辦法打印模塊的輸出？

Question

例如，如果我想查看Test.QuickCheck有哪些輸出，是否可以向GHCI發出命令來執行此操作？

Answer 1

是的，有。鍵入:browse Test.QuickCheck（或任何模塊想要）將打印所有出口：

Prelude> :browse Test.QuickCheck 
(.&.) :: 
    (Testable prop1, Testable prop2) => prop1 -> prop2 -> Property 
(==>) :: (Testable prop) => Bool -> prop -> Property 
(><) :: (Gen a -> Gen a) -> (Gen a -> Gen a) -> Gen a -> Gen a 
class Arbitrary a where 
    arbitrary :: Gen a 
    shrink :: a -> [a] 

... <snip> ... 

vectorOf :: Int -> Gen a -> Gen [a] 
whenFail :: (Testable prop) => IO() -> prop -> Property 
whenFail' :: (Testable prop) => IO() -> prop -> Property 
within :: (Testable prop) => Int -> prop -> Property 

對於GHCI的命令的完整列表，請the documentation。