[Haskell-beginners] Hugs/Haskell Bug

[Stephen Tetley]

Hello David

I've an older version of Hugs installed (Hugs 2003), but the the top
line of ReadP.hs has this pragma:

{-# OPTIONS -fglasgow-exts -fno-implicit-prelude #-}

This means you must to run Hugs with extensions, for the Hugs 2003
that meant running with the command line option / -98 /. For Hugs 2006
this might have changed, though the initial load message should tell
you how to enable extensions.

Hugs is now rather out-of-date unfortunately, unless you are following
a text book that uses it, or a running on a platform were GHC won't
work, then the standard advice nowadays is to use GHC. GHC has an
interpreter, GHCi, that is very similar to Hugs.

Best wishes

Stephen