Haskell Foldable Wats

[Daniel Trstenjak]

On Wed, Feb 24, 2016 at 11:27:48AM -0600, Chris Allen wrote:
> You can't not-include the instances because we'll just end up with orphans so
> that's not cricket I think.

What was the design decision behind orphans? Why were they considered a good idea?

Has there ever been a discussion to only allow instance definitions in
the same library as the data type definition or the class definition?

Greetings,
Daniel