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mm, yea. very happy for help tightening up any cases that we can

this is something we could probably add to the existing `_RuleVisitor` in `rules.py`

we already look to see if there are any `yield` statements without assignments

we could look for `return` statements and raise an error at rule parsing time for this, which actually seems like a reasonable solution

there might be another way to do it but i can't immediately think of a lower-overhead way to get the "this rule is a generator" vs "this rule is a function" bit

bare `return` would always* be a bug here, so could check for that at least