Tweak handling of Self
in object-safety rules and type parameter defaults
#22452
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The big change here is that we update the object-safety rules to prohibit references to
Self
in the supertrait listing. See #22040 for the motivation. The other change is to handle the interaction of defaults that referenceSelf
and object types (whereSelf
is erased). We force users to give an explicit type in that scenario.r? @aturon