>>>>> "Matt" == Matt Gushee <mgushee@havenrock.com> writes:

  Matt> * Is current_polyline defined within the same scope where the error
  Matt>   occurs, or is it received as an argument? If it is the latter, and
  Matt>   somewhere before the error location there is an expression that *uses*
  Matt>   !current_polyline as a point, that would explain your error.  If your
  Matt>   function is too complex to easily identify the problem by sight, an
  Matt>   easy way to check for this would be to put a type constraint on the
  Matt>   parameter:

  Matt>     let myfun (current_polyline:point list ref) =
  Matt>       ....

That was it exactly (see my followup).

However that's a very nice trick for future debuggin effort.

Thanks

Brian

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