GHC 5 seemed to warn that a binding was unused if it was never
referenced. Now (on 6.0.1) it seems to warn if a binding is never
referenced by a used binding. I.e, "used"ness is now transitive.
(Neither version warns about bindings with names beginning with '_'.)
I like the old behavior much better. I often have unexported bindings
(e.g. for testing) with names beginning with '_'. Sometimes these are
the exclusive users of imported or locally defined bindings. With the
GHC 5, I got no warnings. With GHC 6, I do.
Loading the attached file gives me no warnings (with -Wall
-fno-warn-missing-signatures -fno-warn-type-defaults) on GHCi 5.04.3.
I get several on GHCi 6.0.1.
thanks,
mike
import List ( genericTake )
import Maybe ( fromMaybe )
_foo n = genericTake n "abcde"
bar = fromMaybe (error "bar.Nothing")
baz = bar (Just 1)
alpha = head "123"
_beta = alpha : "0"
main = error "main"
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