John McCall c041d1061a Perform component-wise substitution of pack expansions immediately. ...

Substitution of a pack expansion type may now produce a pack type.
We immediately expand that pack when transforming a tuple, a function
parameter, or a pack.

I had to duplicate the component-wise transformation logic in the
simplifyType transform, which I'm not pleased about, but a little
code duplication seemed a lot better than trying to unify the code
in two very different places.

I think we're very close to being able to assert that pack expansion
shapes are either pack archetypes or pack parameters; unfortunately,
the pack matchers intentionally produce expansions of packs, and I
didn't want to add that to an already-large patch.

2023-03-26 04:12:59 -04:00

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