On 8 Apr 2008, at 00:30, Bulat Ziganshin wrote:
At least Hugs complains if one does not indent "deriving ...", but I
do not know what the standard says. If is required, then it can be
changed.
deriving is a part of data clause and indentation just allows us to
continue clause from prev. line. if not indented, deriving will be
parsed as separate clause (and btw such clause, "standalone deriving"
was added to ghc 6.8)
So it seems that if one uses the word "instance" instead of
"deriving", then the compiler can immediately tell when this word
appears whether it is a part if the "data" clause, or the start of a
new "instance" clause. So it can probably be changed, getting rid of
"deriving" which I think is not used elsewhere. It will break a lot
of code, but it is easy to change, and also easy to make a
compatibility mode.
Hans
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