> Yes, I have reported it while back. I don't know of the progress in
fixing this.
Reported what? #15884? [1] You do realize that there is a very simple
workaround for that issue, right? Instead of writing this, which is subject
to the pattern-guard completeness issues observed in #15753:
f :: Maybe a -> Bool
f (id->Nothing) = False
f (id->(Just _)) = True
You can instead write this:
f :: Maybe a -> Bool
f (id -> x) =
case x of
Nothing -> False
Just _ -> True
This will get proper coverage checking, which means that this technique
could be used to remove all of the panicking catch-all cases brought about
by dL view patterns.
Ryan S.
-----
[1] https://ghc.haskell.org/trac/ghc/ticket/15884
[2] https://ghc.haskell.org/trac/ghc/ticket/15753
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