Stuart Cook 13cd5256ac
Rollup merge of #139669 - nnethercote:overhaul-AssocItem, r=oli-obk
Overhaul `AssocItem`

`AssocItem` has multiple fields that only make sense some of the time. E.g. the `name` can be empty if it's an RPITIT associated type. It's clearer and less error prone if these fields are moved to the relevant `kind` variants.

r? ``@fee1-dead``
2025-04-15 15:47:27 +10:00
..
2025-03-11 08:41:15 +00:00
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