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Ownership tracking
==================
For local variables it should be fairly simple.
For structs it is trickier:
1. After construction but before first use (= passing into a function
or storing in a variable/field), all non-optional refs MUST be
initialized.
2. After using a field:
- the field must be set to none, OR
- the struct must be discarded
3. When setting a field:
- the "source" of the field must give ownership, OR
- the source must be set to none, OR
- the source (or it's container) must be discarded
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