Set an attribute template on the object.
The attr_type must be for an attribute which contains a template.
If the attrs Attributes is floating, it is consumed.
This call may block for an indefinite period.
| this |
The object to set an attribute template on. |
| attr_type |
The attribute template type. |
| attrs |
The attribute template. |
| cancellable |
Optional cancellation object, or |
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