The GHC manual already for quite a number of version states:
• Arrow notation (see Section 7.17, “Arrow notation ”) uses whatever
arr, (>>>), first, app, (|||) and loop functions are in scope.
But unlike the other constructs, the types of these functions must
match the Prelude types very closely. Details are in flux; if you want to use
this, ask!
When using this feature we get the error:
"Var/Type length mismatch:
[s{tv aVL} [tv]]
[]
ghc: panic! (the 'impossible' happened)
(GHC version 7.8.3 for x86_64-apple-darwin):
tcTyVarDetails s{tv aVL} [tv]
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug";
So our question is whether we should really report this as a bug, and/or what
we can do about this.
Thanks for your help,
Doaitse
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