Fix #324: Keep track of instance-only imports #380
Merged
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This fixes #324 by keeping track of instances that should be imported from other modules, and generating an empty import list if necessary.
One minor aesthetic problem is that if you have a qualified imports and you also use instances from that module, there will be two imports: one qualified one and one instance-only (unqualified) one. This could probably be fixed too by a smarter way of merging imports, but it doesn't affect correctness so I'm leaving it as-is for now.