b6097f2e1b
Support `#[track_caller]` on async fns Adds `#[track_caller]` to the generator that is created when we desugar the async fn. Fixes #78840 Open questions: - What is the performance impact of adding `#[track_caller]` to every `GenFuture`'s `poll(...)` function, even if it's unused (i.e., the parent span does not set `#[track_caller]`)? We might need to set it only conditionally, if the indirection causes overhead we don't want. |
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