[kazinator]

> you can use the C preprocessor in front of any language.

You will be paddling upriver if that language doesn't have a mostly C-compatible token structure, or has white space sensitivities that C preprocessing doesn't preserve and such.

[shakna]

The C Preprocessor has sensitivities that aren't matched by C in all cases. And in the case of Hare, the tokenisation should be close enough to C that the CPP would only break in the same ways it already does.