This is obviously a personal preference issue, but I try to avoid the
Cabal macros since they don't let my code run outside the context of
Cabal. I often times like to have a test suite that I can just use
with runhaskell, and (unless you can tell me otherwise) I can't run it
anymore.
Also, I think
#if GHC7
...
#endif
is more transparent than a check on template-haskell.
Just in case this hasn't been mentioned yet: if you want to be
independent of cabal, there is the old standby
__GLASGOW_HASKELL__
http://haskell.org/ghc/docs/latest/html/users_guide/options-phases.html#c-pre-processor
Claus
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