This leads to a lot of simplifications, as most code doesn't actually need to know about the specific lifetime/type data; rather, it's concerned with properties like name, index and def_id.

And with one final incanation, the specific kind iterators were banished from ty::Generics, never to be seen again!

Begone lazy lifetime code!

This is sort of confusing "side step". All it does is to change the
representation of a skolemized region. but the source of that universe
index is not the inference context, which is what we eventually want,
but rather an internal counter in the region inference context.

We'll patch that up later. But doing this now ought to help with
confusing diffs later.

Always using root environment for now.

Notably, excluding ReSkolemized

This computes the transitive closure of traits that appear in the
environment and then appends their clauses. It needs some work, but
it's in the right direction.

This makes it consistent with TypeParameterDef.

Resolve them into field indices once and then use those resolutions

+ Fix rebase

Implement inferring outlives requirements for references, structs, enum, union, and projection types. added a feature gate and tests for these scenarios.