2 Mar
2017
2 Mar
'17
11:30 a.m.
On Thu, 2 Mar 2017, Andreas Abel wrote:
Today a student came to me wondering why a certain function produced a regular result, where he had expected an error. Turned out he had used `concat`, but not on a lists of lists as he had thought, but on a lists of `Either a [b]`.
That is, he did (concat (xs :: [Either a [b]]))? Does GHC actually accept that? If at all, it would not have to do with Foldable.