Auto merge of #156187 - inq:obligations-self-ty-recompute-sub-root, r=BoxyUwU,lcnr obligations_for_self_ty: skip irrelevant goals (recompute sub_root from stalled_vars) Supersedes [#146759](https://github.com/rust-lang/rust/pull/146759). Since the original PR is having conflict now, I've rebased. This includes 2 commit 1. the original one with rebase 2. above that, I've changed: ``` if stalled_on is Some: ignore sub_roots -> walk stalled_vars -> re-evaluate sub_root else: same with this PR ``` Why: cached sub_roots can be stale if there is a sub-unification merge after stalling ([lcnr proposed on the original PR](https://github.com/rust-lang/rust/pull/146759#issuecomment-4378162413)) so re-evaluating when reads ---> so more conservative Testing: * next-solver / traits tests * we can follow after merging rust-lang/rust#156172 with -Zdisable-fast-paths Style question: In my preference, inside filter, I used filter_map - matches, but do you prefer if-let chain? Original author: [lcnr](https://github.com/lcnr) [#146759](https://github.com/rust-lang/rust/pull/146759) r? @lcnrÂ
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