I wrote a little Racket meta-language that adds a dispatch macro to the 
readtable for typing string literals without escape characters. You start with 
two or more #'s followed by any non-# character, then the actual string 
content, then end with the same non-# character and the same number of #'s. So

> ##|"foo\bar"|##

evaluates the same as

> "\"foo\\bar\""

Works great, but it does wreak quite some havoc on DrRacket's syntax coloring. 
Unfortunately as far as I can tell the only way to fix that is to replace the 
color lexer entirely; there's no compositon like there is with readtables. Is 
that correct, or is there a trick that I'm missing?

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