> | Is rejecting Haskell 98 modules when -fglasgow-exts is on 
> | also a bug? (i.e. does GHC Haskell aim to be a conservative 
> | extension of H98?)
> 
> Yes, we do so aim, but this seems to be an occasion where
> there's no obvious way to make the extension 100% conservative
> without making the extended language rather clunky.
> 
> You can always use a different type variable name.

I think it is unavoidable that -fglasgow-exts is not a straightforward
superset of Haskell 98.  After all, -fglasgow-exts enables some extra
keywords and gives special meaning to certain symbols that would
otherwise be user-bindable, for example.

Cheers,
        Simon
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