I had another thought about a way to make the bound names explicit.

   # Keyword
   case Point(x -> px, y -> py):

   # Positional
   case Point(-> x, -> y):

   # Sub-pattern, positional
   case Line(Point() -> p1, Point() -> p2):

   # Sub-pattern, keyword
   case Line(start: Point() -> p1, end: Point() -> p2):

--
Greg
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