Re: backward compatibility

On Thu, Jan 20, 2011 at 08:14:29AM +0000, Max Bolingbroke wrote:

On 20 January 2011 02:47, John Meacham wrote:

...

Allowing this was a specific feature that was included in ghc on purpose (as well as the relaxed if/then layout rule in do statements) So this is definitely a regression.

Ian split this out in this patch: http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=ghc;a=darcs_commitdiff;h=201...

(You can see the tests here: http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=testsuite;a=darcs_commitdiff...)

However, when he split it out he made sure that it was still turned on by default unless the package explicitly requested Haskell 98 or 2010 compatibility (with -XHaskell98 or -XHaskell2010) - so I'm not sure why it should cause breakage. I don't have a HEAD build around so I can't find out for myself at the moment.

Yes, it's still on in GHC by default, but Cabal specifies Haskell98 if a language isn't given in the .cabal file. network probably wants to give NondecreasingIndentation as an extension if impl(ghc >= 7.1). Thanks Ian