[Haskell-cafe] CIS 194 not compiling under new GHC

[David Feuer]

The changes needed to make it work should be minor. Since you call out the
chapter on monoids, any Monoid instance now needs a Semigroup instance.

Before:

instance Monoid X where
  mappend a b = ...
  mempty = ...

Now:

instance Semigroup X where
  a <> b = ...
instance Monoid X where
  -- mappend no longer needs to be defined
  mempty = ...

On Sun, Nov 6, 2022, 12:37 PM Borys Kopeć <boryskopec00 at gmail.com> wrote:

> Hi all,
>
> I've been working through the CIS 194
> <https://www.cis.upenn.edu/~cis1940/spring13/lectures.html> course
> recently and unfortunately from lecture 7 onwards the code is not compliant
> with current compiler.
>
> I can still follow the lectures but I'd like to do every homework
> exercise. Unfortunately most homework exercises provide you with a code
> framework to work with and this code does not compile.
>
> Do any of you know about updated versions or corrections to this course? I
> believe there could be a repo where someone is keeping the course's
> homework up to date because this course is still quite popular.
>
> Regards
> Borys
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