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improve comments for `simplify_type` Should now correctly describe what's going on. Experimented with checking the invariant for projections but that ended up requiring fairly involved changes. I assume that it is not possible to get unsoundness here, at least for now and I can pretty much guarantee that it's impossible to trigger it by accident. r? `````@nikomatsakis````` cc #92721
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.