10 Feb
2014
10 Feb
'14
10:03 a.m.
On Mon, Feb 10, 2014 at 5:33 AM, Dominique Devriese < dominique.devriese@cs.kuleuven.be> wrote:
Local instances were already considered by Wadler when he proposed type classes, but they are problematic to combine with type inference
Local instances have a bigger problem: you can use them to trivially violate invariants. Consider a local replacement for Ord on a Data.Map. They're not going to happen. -- brandon s allbery kf8nh sine nomine associates allbery.b@gmail.com ballbery@sinenomine.net unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net