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Also (maybe a python thing? Maybe an is thing?) I can’t just write `yield Get(...)`, I need to `result = yield Get(...) ; yield result`

there shouldn't be any need to `yield Get(..)`, because that would imply that there is a conversion from LHS to RHS

and your rule should yield the RHS rather than the more specific thing

For an aggregate-ish thing, I was looking at:
```
... do some stuff
for target in targets:
  yield Get(Foo, Bar, bar)
```

but I that just doesn’t work because we don’t yield into collections; you can only yield once in the function?

well, when you yield in a method body, that method becomes a generator

if you yield in a nested method, that nested method beceomes generator

a `@rule` could/can consume a nested generator... it just wouldn't be the engine consuming it