[DiscardingTG] Fix runtime signature mismatch for statically known -> Void
closure
#66219
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Since #65613, DiscardingTG started to accept
() -> Void
instead of() -> T
, but it also changed the number of arguments accepted by the closure from 3 to 2. So it should usenon_future_adapter
instead offuture_adapter
to avoid runtime signature mismatch.