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4a175523b1
Fix return type notation errors with -Zlower-impl-trait-in-trait-to-assoc-ty This just adjust the way we check for RPITITs and uses the new helper method to do the "old" and "new" check at once. r? `@compiler-errors`
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.