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.
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