David M. Johnson dmjio

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]

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 ...

Haskell Resources

#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:

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 }

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.

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 \

	{-# 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)

	# 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.

	#
	# 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 () {

	; The stack pointer is going to be an index into the stack, and the
	; stack is an array of words. The alternative would be to have the
	; stack pointer me a pointer to memory, but this is perhaps a bit
	; nicer, as where the stack actually lives is totally irrelevant.

	@stack = global [1000 x i64] undef
	@sp = global i64 undef;

	; Now we have the basic stack operations: push, pop, and peek. As can
	; be seen from the definitions, LLVM is typed, which is really nice as