Confusing warning message with -Wduplicate-exports
Consider this program:
module Internal where
data Foo = Foo
and
{-# OPTIONS_GHC -Wduplicate-exports #-}
module External
( module Internal
, Foo
) where
import Internal (Foo)
Compiler says this:
External.hs:4:7: warning: [-Wduplicate-exports]
‘Foo’ is exported by ‘Foo’ and ‘module Internal’
|
4 | , Foo
| ^^^
The first part of message reads a bit strange. Wouldn't it be better to have something like "‘Foo’ is already exported by ‘module Internal’?
Ideally we would also suggest to delete the (Foo)
in import Internal (Foo)
in External.hs
ghc 9.2.4