ambiguous ?

[Jim Giles]

>From article <11318 at smoke.BRL.MIL>, by gwyn at smoke.BRL.MIL (Doug Gwyn):
> The proposed ANSI Standard for C leaves the order of argument
> evaluation unspecified, thus it depends on the implementation.
> This is indeed the way it always has been.

If they had meant that the behaviour was simply implementation defined,
that's what they would have said.  The standard SPECIFICALLY separates
the concept of implementation defined from the concept of unspecified
behaviours.