Try.do for recoverable errors in Haskell

UPDATE 2021-01-02: I have since written a GHC compiler plugin to implement an alternative ?-based syntax for early return. I prefer that one than use of Try.do, because it doesn’t require any type magic or special instances, and the ? is more readable. UPDATE: I’ve added a follow-up post to this here, where I address some criticisms of this post. The first half of this post is here. Please read th

[igrep]

ああー、これきっかけに標準のIOException投げる関数もEither IOException aにかわらないかなー