Haskell import and export

Question

I am from zero to Haskell, and I have the following error that can't get away. Basically t2 is trying to use the function add1 defined in the other module t1. So

t1.hs-----
module t1 (add1) where
add1 :: Int -> Int
add1 x = x + 1

t2.hs-----
module t2 where
import t1
   add1 2

The error always says parse error on inputt2'`

What's the problem?

Answer 1

Module names should be uppercase, your t2.hs file also has some issues, I've modified it so you should be able to run it with runghc t2.hs and see some output:

t1.hs

module T1 (add1) where
add1 :: Int -> Int
add1 x = x + 1

t2.hs

module T2 where
import T1
main = do
  let x = add1 2
  putStrLn (show x)