A style function must return a named list of functions. Possible entries:
reserved: reserved words
number: numeric literals
operator: operators, including assignment
call: function calls
string: character literals
Each entry in a list must be a function that takes a character scalar, and returns a character scalar. The default style adds ANSI formatting to the code.
Note that you can also change the code if you like, e.g. to include a unicode arrow character instead of the two-character assignment operator.
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