OCaml tip: never use a module as a hole in a module type except in invariant position, only ever use types or invariant modules as holes; otherwise weird covariance / contravariance will bite you.
3:43 PM - 29 Jun 2018
0 replies
2 retweets
3 likes
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.
Read my blog!