On 11 Sep 2008, at 3:54 am, Brandon S. Allbery KF8NH wrote:

I think that only counts as the origin of the idea; isn't :-prefixed infix constructors a ghc-ism?

Haskell 98 report, page 10: "An operator symbol starting with a colon is a constructor". (I seem to have four copies of the report on my Mac...)