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    Cool, it’s Shen! I became aware of this language years ago but have never really seen any content about it (I think it was closed source / not free for a while?)

    I enjoyed this post, and I have one (probably stupid) question: do you actually have to type out lines of -------------- or =========== in the REPL when defining datatypes?

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      Yes, the _____ and ===== lines have to be typed in the REPL. You don’t need to match them to the length of the code, just one _ or = suffices. So these are equivalent:

      N : number;
      __________
      N : integer;
      
      N : number;
      _
      N : integer;
      

      In the REPL I make it short for ease of typing, in files I make it long to look nicer.