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98659a339d
This removes special-casing of boxes from `rustc_pattern_analysis`, as a first step in replacing `box_patterns` with `deref_patterns`. Incidentally, it fixes a bug caused by box patterns being represented as structs rather than pointers, where `exhaustive_patterns` could generate spurious `unreachable_patterns` lints on arms required for exhaustiveness; following the lint's advice would result in an error.