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?