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44d50f9acf
Adjust `with_generic_param_rib`. Currently all of its call sites construct a `LifetimeRibKind::Generics` value, which `with_generic_param_rib` then deconstructs (and panics if it's a different `LifetimeRibKind` variant). This commit makes the code simpler and shorter: the call sites just pass in the three values and `with_generic_param_rib` constructs the `LifetimeRibKind::Generics` value from them. r? `@petrochenkov`