[nhc-bugs] Literate scripts not handled correctly

[Ian Lynagh]

Hi all

My understanding is that the following script:

----- cut here -----

> foo :: Int -> Int
> foo _ = 2

\begin{code}

bar :: Int -> Int
bar _ = 1

\end{code}

----- cut here -----

should be valid and define foo and bar (although the report does say "It
is not advisable to mix these two styles in the same file").

However, in hugs:
ERROR Q.lhs:7 - Syntax error in input (unexpected symbol "bar")

% ghc -c -o Q.o Q.lhs
Q.lhs:7: parse error on input `bar'

% nhc98 -c -o Q.o Q.lhs 
In file ./Q.lhs:
7:1 Found bar but expected a {-EOF-}



Secondly, in the following script (which I think should define main
according to the report):

----- cut here -----

    \begin{code}

module Main where

main :: IO()
main = putStrLn "Foo"

    \end{code}

----- cut here -----

hugs:
ERROR W.lhs:12 - Empty script - perhaps you forgot the `>'s?

% nhc98 -c -o W.o W.lhs
Warning: Can not find main in module Main.

ghc -c -o W.o W.lhs 
W.lhs line 11: unlit: missing \end{code}

Interestingly it works in GHC if you remove the white space before the
end but not before the begin.


Thanks
Ian