From: gneuner2@comcast.net   
      
   On Sat, 18 Jun 2022 19:42:55 +0000, Roger L Costello   
    wrote:   
      
   >... "What other programming languages are simply   
   >abstractions on top of an existing programming language?"   
      
   In addition to gah4's excellent list, I would include Lisp in which a   
   significant fraction is implemented as macros which build on a simpler   
   version of Lisp. And of course, Lisp's metalanguage is Lisp.   
      
   Some amount of Scheme also is macros building on simpler Scheme,   
   however Scheme's metalanguage is not Scheme but a hybrid that includes   
   Scheme. How much is implemented using macros depends on the particular   
   implementation.   
      
   YMMV,   
   George   
      
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