在GHC中，有没有办法打印模块的输出？

Question

例如，如果我想查看Test.QuickCheck有哪些输出，是否可以向GHCI发出命令来执行此操作？

Answer 1

是的，有。键入:browse Test.QuickCheck（或任何模块想要）将打印所有出口：

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 

对于GHCI的命令的完整列表，请the documentation。