John McCall 80551ce8ad [NFC] Thread a common type through all the AST substitution code. ...

There are a lot of problems caused by our highly-abstract substitution
subsystem.  Most of them would be solved by a more semantic / holistic
understanding of the active transformation, but that's difficult to do
because we just pass around function_refs.  The first step in fixing
that is to pass around a better currency type.  For now, it can just
hold the function_refs (and the SubstOptions).

I've set it up so that the places that just apply SubstitutionMaps
are constructing the IFS in a standard way; that should make it easy
to change those places in the future.

2023-03-25 18:54:14 -04:00

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