I had talked to @jroesch , and we think that there is two thing: the function (what we currently have), and the pass. the pass is essentially a function from (Module, PassContext) to Module (yes, only Module), while the function can has different form - it may take an expr, or it may take a module, or even more info, etc. the pass also should probably be done in C++, as we have the C++ build system merged recently.
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