As of [fantasyland/fantasy-land#152](https://github.com/fantasyland/fantasy-land/pull/152) implement [ChainRec](https://github.com/fantasyland/fantasy-land#chainrec) specification. [MonadRec instance for either](https://github.com/purescript/purescript-tailrec/blob/master/src/Control/Monad/Rec/Class.purs#L89-L95) in purescript might be usefull Here is [implementation](https://github.com/safareli/free/blob/e5fbbde2c50a1ec61968ec7c529aa3bb8ea51841/src/tailRec.js#L25-L98) with [tests](https://github.com/safareli/free/blob/e5fbbde2c50a1ec61968ec7c529aa3bb8ea51841/test/tailRecM.js) (it's not quite correct as it is not handling cleanup stuff of the data.task but without that it works well) I would create PR when have time.
As of fantasyland/fantasy-land#152 implement ChainRec specification.
MonadRec instance for either in purescript might be usefull
Here is implementation with tests (it's not quite correct as it is not handling cleanup stuff of the data.task but without that it works well)
I would create PR when have time.