If we define expressiveness as no. of users / lines of code, which languages/libraries/frameworks/programs would score highest and lowest?
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What are the most popular languages that have used an AST walker for their implementation?
I know Ruby used to do this, but there must be others.
(I'm interested in the lowest PL speed that users will tolerate if you have awesome features.)
It is remarkably hard to escape command line arguments safely on Windows, and the standard libraries of multiple languages have needed patching: https://flatt.tech/research/posts/batbadbut-you-cant-securely-execute-commands-on-windows/
Over a sufficiently long time horizon, all code you write is legacy code.