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9c3064e131
Retire hir::*ItemRef. This information was kept for various places that iterate on HIR to know about trait-items and impl-items. This PR replaces them by uses of the `associated_items` query that contain pretty much the same information. This shortens many spans to just `def_span`, which can be easier to read.
For more information about how rustc works, see the rustc dev guide.