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Diagnose anonymous lifetimes errors more uniformly between async and regular fns Async fns and regular fns are desugared differently. For the former, we create a generic parameter at HIR level. For the latter, we just create an anonymous region for typeck. I plan to migrate regular fns to the async fn desugaring. Before that, this PR attempts to merge the diagnostics for both cases. r? ```@estebank```
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.