chore(rt): preserve executor caller locations#283
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Tokio task hooks report the source location of the tokio::spawn call. When hyper-util's executor glue performs that spawn, the recorded location points at the executor implementation itself. That is technically correct, but it hides the more useful callsite: the code path in Hyper or hyper-util that asked the executor to create background work. Mark the executor forwarding methods with track_caller so task instrumentation can attribute spawned tasks to the caller that requested execution rather than to the generic executor glue.
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Tokio task hooks report the source location of the tokio::spawn call. When hyper-util's executor glue performs that spawn, the recorded location points at the executor implementation itself. That is technically correct, but it hides the more useful callsite: the code path in Hyper or hyper-util that asked the executor to create background work.
Mark the executor forwarding methods with track_caller so task instrumentation can attribute spawned tasks to the caller that requested execution rather than to the generic executor glue.