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For "Week 5" I did TCL, and it kind of set my brain on fire with "wait… you can just DO that?".

In TCL, strings are anonymous functions and vice versa. In my old Emily language, "if" and "while" blocks were implemented by passing in lambdas; but in TCL you do the same thing by *passing in a string containing {the code to execute}*. I started trying to imagine what "hygienic" TCL would be; if TCL is a C macro, I want an ML or Rust macro. I tried to imagine something closer to LISP than TCL.