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47575bb066
Track implicit `Sized` obligations in type params When we evaluate `ty::GenericPredicates` we introduce the implicit `Sized` predicate of type params, but we do so with only the `Predicate` its `Span` as context, we don't have an `Obligation` or `ObligationCauseCode` we could influence. To try and carry this information through, we add a new field to `ty::GenericPredicates` that tracks both which predicates come from a type param and whether that param has any bounds already (to use in suggestions). We also suggest adding a `?Sized` bound if appropriate on E0599. Address part of #98539.
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.