I believe this is probably an instance of
https://ghc.haskell.org/trac/ghc/ticket/3927
There are numerous other similar tickets, about GHC's inadequate/misleading
warnings for non-exhaustive patterns. A selection is
#595, #5728, #3927, #5724, #5762, #4139, #6124, #7669, #322, #8016,
Hi Simon,
Thanks for the clarification, I attached the code to that ticket. Does this
mean improvements in this area are supposed to land in 7.10?
Semi-relatedly, before attempting the current code (which at least compiles), I
had a few other attempts and I was hoping you (or other readers)
This is a bug in 7.8.3: https://ghc.haskell.org/trac/ghc/ticket/9433
You should get this error (and do in HEAD):
Sock.hs:28:5:
Type family 'Readable' should have 1 argument, but has been given none
In the equations for closed type family 'Foo'
So your program is indeed wrong, but the
Welcome to issue 304 of the HWN, an issue covering crowd-sourced bits
of information about Haskell from around the web. This issue covers
from August 24 to 30, 2014
Quotes of the Week
* pjdelport: Haskell: Lazy evaluation, eager debugging.
* trap_exit: isn't hoogle awesome? the first
