search graph: cache provisional results between fixpoint iterations #125167
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rustbot
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Some changes occurred to the core trait solver cc @rust-lang/initiative-trait-system-refactor |
This was referenced May 19, 2024
matthiaskrgr
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May 20, 2024
…rors track cycle participants per root The search graph may have multiple roots, e.g. in ``` A :- B B :- A, C C :- D D :- C ``` we first encounter the `A -> B -> A` cycle which causes `A` to be a root. We then later encounter the `C -> D -> C` cycle as a nested goal of `B`. This cycle is completely separate and `C` will get moved to the global cache. This previously caused us to use `[B, D]` as the `cycle_participants` for `C` and `[]` for `A`. split off from rust-lang#125167 as I would like to merge this change separately and will rebase that PR on top of this one. There is no test for this issue and I don't quite know how to write one. It is probably worth it to generalize the search graph to enable us to write unit tests for it. r? `@compiler-errors`
rust-timer
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May 21, 2024
Rollup merge of rust-lang#125308 - lcnr:search-graph-5, r=compiler-errors track cycle participants per root The search graph may have multiple roots, e.g. in ``` A :- B B :- A, C C :- D D :- C ``` we first encounter the `A -> B -> A` cycle which causes `A` to be a root. We then later encounter the `C -> D -> C` cycle as a nested goal of `B`. This cycle is completely separate and `C` will get moved to the global cache. This previously caused us to use `[B, D]` as the `cycle_participants` for `C` and `[]` for `A`. split off from rust-lang#125167 as I would like to merge this change separately and will rebase that PR on top of this one. There is no test for this issue and I don't quite know how to write one. It is probably worth it to generalize the search graph to enable us to write unit tests for it. r? `@compiler-errors`
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closing this for now, rewrote this PR in a separate branch and am still not convinced it is sound. Will require some further thought until anything's ready to land here |
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will still go through it once to add some comments and to explain the general idea somewhere before merging this.
r? @nikomatsakis @compiler-errors