CODEWITHSUNDEEP
haskell
Anonymous
Anonymous

Reputation: 1

Haskell How to print info of some function in haskell like "ghci> :info func"

I'm new to haskell. Sometimes I write some complicated functions that I'm not so sure about the types myself, so I don't define its type beforehand, compiling and running still work fine. I want to know if I can print out the types of that function like in "ghci> :info someFunc" in the program, just to see how Haskell define its. Maybe something like this:

f x = 2*x

main :: IO()
main = do
    print_info f

I know I can "ghci> :load program.hs" & then ":info f", but for me it is quite unconvenient & sometime working with ghci can be ugly.

Upvotes: 0

Views: 191

Answers (1)

Daniel Wagner
Daniel Wagner

Reputation: 153182

Can't be done. You can sort of get close with Typeable, but polymorphism cannot be captured, even in principle.

Instead, I recommend that you set up the Haskell Language Server and connect your editor to it; most editors support at least the level of connection that lets you hover a term to see its type or add a type signature to a definition with a keybinding.

Upvotes: 2

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