To just quickly address (3), I meant to use a preprocessor (the meta-preprocessor) to write the translator, not to write a preprocessor. To address (4), you would use the package ocaml-base-compiler, library ocamlcommon, module Compile_common, function parse_impl, to get the Parsetree.structure (AST). Then you would pass this to your translator function, and the translator function could write Julia code to a text file directly.
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