A workflow declared asynchronous cannot be launched and waited on
Asking to wait for a result the workflow has already said it will not deliver inline is a mistake worth catching before anything runs.
The rule
Normative: this is the rule
A launch requesting a synchronous wait against a workflow declared asynchronous is refused before any execution is created, so no run is started and nothing is left behind.
Rule identifiers are permanent and are never renumbered. Each implementation publishes its own standing against these rules; this specification does not.spec 1.0-draft · MAN-19 · changed in spec 1.0