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### `execution::get_delegation_scheduler` <a id="exec.get.delegation.scheduler">[[exec.get.delegation.scheduler]]</a>
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`get_delegation_scheduler` asks a queryable object for a scheduler that
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can be used to delegate work to for the purpose of forward progress
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delegation [[intro.progress]].
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The name `get_delegation_scheduler` denotes a query object. For a
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subexpression `env`, `get_delegation_scheduler(env)` is
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expression-equivalent to
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`MANDATE-NOTHROW(AS-CONST(env).query(get_delegation_scheduler))`.
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*Mandates:* If the expression above is well-formed, its type satisfies
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`scheduler`.
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`forwarding_query(execution::get_delegation_scheduler)` is a core
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constant expression and has value `true`.
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