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Arbitrary self types v2: adjust diagnostic. The recently landed PR #132961 to adjust arbitrary self types was a bit overenthusiastic, advising folks to use the new Receiver trait even before it's been stabilized. Revert to the older wording of the lint in such cases. Tracking issue #44874 r? ``@wesleywiser``
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.