Iterate over all attributes associated with the return value.
The iterator structure is typically stack allocated, and must have its first member initialized to null.
Both the name and value should be treated as constants and must not be freed.
See iterate_attributes for an example of how to use a similar API.
| iterator |
a AttributeIter structure, must be initialized; see below |
| name |
Returned name, must not be freed |
| value |
Returned name, must not be freed |
| info |
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