I've installed Leksah 0.12.1.3 on Xubuntu 13.10 from terminal.
sudo apt-get install leksah
Opened leksah, created new workspace and package. Main.hs is created by default with 'Hello world' program.
module Main (
main
) where
import Control.Monad (unless)
import Data.List (stripPrefix)
import System.Exit (exitFailure)
import Test.QuickCheck.All (quickCheckAll)
-- Simple function to create a hello message.
hello s = "Hello " ++ s
-- Tell QuickCheck that if you strip "Hello " from the start of
-- hello s you will be left with s (for any s).
prop_hello s = stripPrefix "Hello " (hello s) == Just s
-- Hello World
exeMain = do
putStrLn (hello "World")
-- Entry point for unit tests.
testMain = do
allPass <- $quickCheckAll -- Run QuickCheck on all prop_ functions
unless allPass exitFailure
-- This is a clunky, but portable, way to use the same Main module file
-- for both an application and for unit tests.
-- MAIN_FUNCTION is preprocessor macro set to exeMain or testMain.
-- That way we can use the same file for both an application and for tests.
#ifndef MAIN_FUNCTION
#define MAIN_FUNCTION exeMain
#endif
main = MAIN_FUNCTION
Now, if I try to run package, or write anything in editor, in lower-right window
========== 127 ==========================
appears.
This happens to me a lot.... I don't know what the cause is, but (at least in my case) I know I can fix the problem by just using the command line. I just "cd" into the directory with the package (the one with the *.cabal file), and type
after this is done, Leksah works properly. Clearly it is a Leksah bug, but it is easy to work around.