Here's a little trick that I often use for inclusion and exclusion of a chunk of code. Imagine we have a function foo defined below. The three lines of code can be included or excluded just by a changing a single character --- that's the trick. So, the idea is to comment our code in a slightly different way like this to exclude the code from executing: 1 {- 2 myand :: Bool -> Bool -> Bool 3 myand a b = if a == b then True 4 else False 5 --} Notice how line 5 is commented '--}' instead of '-}'. Now, if we change the first character in line 11 from '{' to '-' the entire chunk of code from line 12-14 no longer remains comment. 11 -- 12 myand :: Bool -> Bool -> Bool 13 myand a b = if a == b then True 14 else False 15 --} This trick can also be applied to C++ comments. Best wishes, Sunil