overriding "*", was Re: What's the ICFP Programming contest?

[tmoran@acm.org]

For the contest I needed to override normal fixed point multiply and
divide, so I declared
  type Root_Numbers is delta ...
  type Numbers is new Root_Numbers;
  function "*"(Left, Right : Numbers) return Numbers;
  A, B, C : Numbers;
and tried to use it in formulas like
  C := Numbers(A * B);
But a compiler said the "*" was ambiguous between my function and Standard.
It seems to me I overrode, and thus hid, Standard."*", no?
  p.s. I did manage to write a program that successfully drove the first 5
out of 9 race tracks.  It gets really lost though in the maze-like ones.
The "programming" contest really becomes an "algorithm" contest there.