I came across with the following code recently and it bothers me a lot lowerSafeForeignCall dflags block | (entry, middle, CmmForeignCall { .. }) <- blockSplit block = do -- do block stuffs -...

In a code base I'm reading, I found a function declaration like this (some parts are missing): filepathNormalise :: BS.ByteString -> BS.ByteString filepathNormalise xs | isWindows, Just (a,xs)...

I am going through Learn you a haskell book, and in Chapter 8 there is a snippet of code which looks like this data LockerState = Taken | Free deriving (Eq, Show) type Code = String type LockerMap...

I'm writing a program on the classification of musical intervals. The conceptual structure is quite complicated and I would represent it as clearly as possible. The first few lines of code are a sm...

I'm observing an interesting behavior when using pattern matching with pattern guards and all warnings turned on {-# OPTIONS_GHC -Wall #-} module Mood where data Mood = Happy | Indifferent | Sa...

Learning Haskell and I am not sure why I don't get the expected result, given these definitions: instance Ring Integer where addId = 0 addInv = negate mulId = 1 add = (+) mul = (*) class Ri...

My Haskell project includes an expression evaluator, which for the purposes of this question can be simplified to: data Expression a where I :: Int -> Expression Int B :: Bool -> Expressio...