Hi,
The following program was accepted by previous versions of GHC, but is
not in GHC 5.02
module HidingBug where
import Prelude hiding (lookup)
lookup env x = Prelude.lookup x env
Instead, you get the error message
HidingBug.hs:4: Variable not in scope: `Prelude.lookup'
This behaviour does not seem to agree with (the latest version of) the
Haskell 98 Report, which in section 5.6.1 says
The Prelude module is imported automatically into all modules as if
by the statement `import Prelude', if and only if it is not imported
with an explicit import declaration. This provision for explicit
import allows values defined in the Prelude to be hidden from the
unqualified name space. The Prelude module is always available as a
qualified import: an implicit `import qualified Prelude ' is part of
every module and names prefixed by `Prelude.' can always be used to
refer to entities in the Prelude.
and in section 5.3 says
The effect of multiple import declarations is strictly cumulative...
Regards,
Thomas Hallgren
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