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{-# LANGUAGE ScopedTypeVariables #-}
module Main where

import Control.Monad (forM_)
import Data.Maybe (fromMaybe)

generalisedFizzBuzz
    :: forall a f m
     . (Foldable f, Semigroup m)
    => (a -> m) -> (a -> a -> Bool) -> f (a, m) -> a -> m

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#include <stdio.h>

int main(int argc, char **argv)
{
    int d = sizeof(0)["ABCDEFGHIJKLMNOPQRSTUWVXYZ"];
    printf("%d\n", d);
    return 0;
}

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data MyState s a = MyState (s -> (a, s))

get :: MyState s s
get = undefined

put :: s -> MyState s ()
put = undefined

modify :: (s -> s) -> MyState s ()
modify = undefined

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#include <stdio.h>

char X = 'a';

int main(int argc, char* argv[])
{
    (void) argc;
    (void) argv;

    struct X {

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import Foreign

main :: IO Int
main = peek nullPtr

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Why You Should Stop Saying "Concrete Type"!

TL;DR: There is no concrete (hah!) definition of "concrete type", different people are meaning different things by those words and assuming everyone else means the same thing.

A Quick Type Primer

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The Cabal/Stack Disambiguation Guide

One of the most frequently asked Haskell beginner questions in recent years is:

"Stack or cabal?"

I will helpfully not answer this question. Instead I will hope to eliminate the confusion that many of the askers seem to have about the various different