I'm asking for support of:
http://hackage.haskell.org/trac/haskell-prime/wiki/PrefixMinusResolution
Just to note that nhc98 appears to fulfill the outcome of this
resolution algorithm already, with the exception of example x7, which
is parsed as -(4#5).
However, nhc98 goes further and permits the declaration of arbitrary
prefix operators, using the syntax
prefix negate 6 -
yes, in addition to
infix 6 -
I think the rationale is that the prefix symbol must map to a non-
symbolic function name, because the same symbol may also refer to a
function of a different type when used infix. The resolution of
prefix/infix chains and sections is quite involved, but not enormous:
see
http://darcs.haskell.org/york-compiler98/Fixity.hs
Regards,
Malcolm
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