Hierarchy of Syntactic Controversy with examples from well-known languagespic.twitter.com/5upXAW5Cr7
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How about a language supporting significant indent like Python, and having nice syntax for call a function with an indented text block?
That's basically heredoc syntax. The thing is this only works one level deep. If you want more you need inheritance of some sort.
For example a free monad is just a GADT + a few LOCs, really lightweight way to define a language. It composes. No such thing for syntax.
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