On Fri, 9 Jan 2009, Ross Paterson wrote:
On Fri, Jan 09, 2009 at 01:11:12AM +0100, Henning Thielemann wrote:
Maybe the report is not complete? I mean, the current behaviour of Hugs
and GHC (as I observed it) is more consistent, and maybe that's what the
designers had in mind.
I'm puzzled by the Hugs behaviour. The current version rejects it, and
I downloaded and built the Mar2005 version just to check, and it also
rejected it, saying
Illegal Haskell 98 class constraint in class declaration
You are right. I don't know, what I made different before. Btw. 2005 was
the copyright year, Hugs' version is September 2006:
__ __ __ __ ____ ___ _________________________________________
|| || || || || || ||__ Hugs 98: Based on the Haskell 98 standard
||___|| ||__|| ||__|| __|| Copyright (c) 1994-2005
||---|| ___|| World Wide Web: http://haskell.org/hugs
|| || Bugs: http://hackage.haskell.org/trac/hugs
|| || Version: September 2006 _________________________________________
Haskell 98 mode: Restart with command line option -98 to enable extensions
ERROR "src/Data/Spreadsheet/CharSource.hs":14 - Illegal Haskell 98 class
constraint in class declaration
*** Constraint : Monad (a Maybe)
*** Context : (Monad (a Maybe), Monad (a Identity))
So, since GHC allows this extension without an option - how can I tell
Cabal, which extension I'm using? Has it a name anyway?
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