imeckler

{-# LANGUAGE LambdaCase #-}

import Control.Applicative
import Control.Monad.State
import System.Random

data Tree a = Empty | Bin a (Tree a) (Tree a)
    deriving Show

-- O(n)

pyrtsa

When installing Haskell Platform fails on Mac OS X (with quick fix below)

I was fighting with Haskell last weekend. At first, I couldn't install some missing libraries with Cabal, and then, when trying to find out what's wrong, I ended up removing the whole Haskell installation — only to find out I could no longer install neither the Haskell Platform nor even just Cabal Install! The warnings I would see were more or less about the use of the single quote in source code:

Preprocessing library text-0.11.2.3...

Data/Text.hs:6:52:
     warning: missing terminating ' character [-Winvalid-pp-token]

-- Copyright : (c) 2009, 2010, 2011, 2012 Bryan O'Sullivan,

i-e-b

My experiments with an XMonad setup in NixOS. This is my work box now, so it pretty much works.

probably needs:

# useradd -m iain
# passwd iain ...
# passwd root ...

leroux

Haskell Resources

• Learning Haskell
• Learn You a Haskell for Great Good
  • Learn You A Haskell Exercises
• Real World Haskell
• FPComplete's School of Haskell
• Haskell Wikibook
• Write Yourself a Scheme in 48 Hours
• Parallel and Concurrent Programming in Haskell

nikita-volkov

#Anonymous records. A solution to the problems of record-system.

Please, beware that the proposal that follows has been implemented as a library.

The current record system is notorious for three major flaws:

1. It does not solve the namespacing problem. I.e., you cannot have two records sharing field names in a single module. E.g., the following won't compile:

data A = A { field :: String }

wsargent

303 See Other

Location: https://github.com/wsargent/docker-cheat-sheet

Hi there!

The docker cheat sheet has moved to a Github project under https://github.com/wsargent/docker-cheat-sheet.

Please click on the link above to go to the cheat sheet.

cartazio

PSA :

just use GHC for OSX https://ghcformacosx.github.io

the rest of these directions are preserved for historical purposes

TLDR version, if you have homebrew

xcode-select --install ; brew tap homebrew/versions ;   brew tap homebrew/dupes \

timmytofu

# unregister broken GHC packages. Run this a few times to resolve dependency rot in installed packages.
# ghc-pkg-clean -f cabal/dev/packages*.conf also works.
function ghc-pkg-clean() {
  for p in `ghc-pkg check $* 2>&1  | grep problems | awk '{print $6}' | sed -e 's/:$//'`
  do
    echo unregistering $p; ghc-pkg $* unregister $p
  done
}

# remove all installed GHC/cabal packages, leaving ~/.cabal binaries and docs in place.

co-dan

#
# This simple script displays whether you are in a cabal sandbox
# the the result of checking for a sandbox is cached, but now that I
# actually think about it, it was probably an unnecessary step.
# Don't forget to customize the PROMPT variable at the bottom 
#
# Looks like this with my prompt: https://files.app.net/rjphjAG9.png
#

function update_cabal_sandbox_info () {

Justasic

/*
 * Copyright (c) 2013-2017, Justin Crawford <Justin@stacksmash.net>
 *
 * Permission to use, copy, modify, and/or distribute this software for any purpose
 * with or without fee is hereby granted, provided that the above copyright notice
 * and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO
 * THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL