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48d311898b
Remove some glob imports from the type system Namely, remove the glob imports for `BoundRegionConversionTime`, `RegionVariableOrigin`, `SubregionOrigin`, `TyOrConstInferVar`, `RegionResolutionError`, `SelectionError`, `ProjectionCandidate`, `ProjectionCandidateSet`, and some more specific scoped globs (like `Inserted` in the impl overlap graph construction. These glob imports are IMO very low value, since they're not used nearly as often as other globs (like `TyKind`).
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.