John McCall a05fef5122 Implement parameter arity reabstraction. ...

This is largely a matter of changing the main loop over subst
params in TranslateArguments to use the generators I added,
then plugging back into the general reabstraction infrastructure.

Because we don't have pack coroutines, we're kind of stuck in
the code generation for pack reabstraction: we have to write
+1 r-values into a temporary tuple and then write those tuple
element addresses into the output pack.  It's not great.  We
also have lifetime problems with things like non-escaping
closures --- we have that problem outside of reabstraction
thunks, too.

Other than that glaring problem, I'm feeling relatively good
about the code here.  It's missing some peepholes, but it should
work.  But that that's not to say that arity reabstraction works
in general; my attempts to test it have been exposing some
problems elsewhere, and in particular the closure case crashes,
which is really bad.  But this gets a few more things working,
and this PR is quite large already.

2023-03-20 20:06:08 -04:00

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