Re: [Haskell-cafe] A useful trick for inclusion and exclusion of commented code

Wolfgang Jeltsch wrote:

does this trick also work with GHC? I think that GHC needs a space after -- if these two dashes shall introduce an one line comment.

It works with GHC, too, and this conforms to the H98 report, section 9.2 (Lexical Syntax): http://haskell.org/onlinereport/syntax-iso.html#sect9.2 The main reason for this to work is that the braces are classified as "special". If they were classified as "symbol", '--}' would be a "varsym", not the start of a comment. Cheers, S.