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prioritize param env candidates if they don't guide type inference #109724

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merged 3 commits into from
Apr 10, 2023
Merged

prioritize param env candidates if they don't guide type inference #109724

merged 3 commits into from
Apr 10, 2023

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lcnr
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@lcnr lcnr commented Mar 29, 2023

intended to supersede #109579. We disable the prioritization during coherence to maintain completeness.

Long term we can hopefully replace this hack with adding OR to external constraints at which point the only relevant part when merging responses is whether they guide type inference in the same way.

Reuses try_merge_responses for assembly and the cleanest way to impl that was to actually split that so that try_merge_responses returns None if we fail to merge them and then add flounder which is used afterwards which is allowed to lower the certainty of our responses.

If, in the future, we add the ability to merge candidates YES: ?0 = Vec<u32> and YES: ?0 = Vec<i32> to AMBIG: ?0 = Vec<?1>, this should happen in flounder.

r? @compiler-errors @BoxyUwU

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. WG-trait-system-refactor The Rustc Trait System Refactor Initiative labels Mar 29, 2023
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rustbot commented Mar 29, 2023

Some changes occurred to the core trait solver

cc @rust-lang/initiative-trait-system-refactor

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compiler-errors approved these changes Mar 29, 2023
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compiler/rustc_trait_selection/src/solve/assembly/structural_traits.rs Outdated Show resolved Hide resolved
compiler/rustc_trait_selection/src/solve/mod.rs
Comment on lines +326 to +332
response.value.certainty == Certainty::Yes
&& response.has_no_inference_or_external_constraints()
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Noting that while sound, returning yes if we find a candidate with no external constraint eventually may need to be weakened for lcnr/solver-woes#12 (comment) to compile.

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i hope to move the prioritization to compute_alias_eq_goal instead and keep try_merge_candidates complete. might not work out perfectly but that's my vibe here for now.

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r=me, nits or not (i guess there's only like one nit, the rest are just observations)

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bors commented Mar 30, 2023

☔ The latest upstream changes (presumably #109734) made this pull request unmergeable. Please resolve the merge conflicts.

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bors commented Mar 31, 2023

☔ The latest upstream changes (presumably #109791) made this pull request unmergeable. Please resolve the merge conflicts.

@lcnr lcnr force-pushed the prioritize-env branch 5 times, most recently from 9e3928f to 013472c Compare March 31, 2023 07:18
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r=me

@compiler-errors compiler-errors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Apr 9, 2023
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lcnr commented Apr 10, 2023

@bors r=compiler-errors rollup

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bors commented Apr 10, 2023

📌 Commit 3fab7f7 has been approved by compiler-errors

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Apr 10, 2023
@Dylan-DPC Dylan-DPC mentioned this pull request Apr 10, 2023
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bors added a commit to rust-lang-ci/rust that referenced this pull request Apr 10, 2023
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Auto merge of rust-lang#110137 - Dylan-DPC:rollup-fdruvwp, r=Dylan-DPC
d4be8ef 
Rollup of 6 pull requests

Successful merges:

 - rust-lang#109724 (prioritize param env candidates if they don't guide type inference)
 - rust-lang#110021 (Fix a couple ICEs in the new `CastKind::Transmute` code)
 - rust-lang#110044 (Avoid some manual slice length calculation)
 - rust-lang#110115 (compiletest: Use remap-path-prefix only in CI)
 - rust-lang#110121 (Fix `x check --stage 1` when download-rustc is enabled)
 - rust-lang#110124 (Some clippy fixes in the compiler)

Failed merges:

 - rust-lang#109752 (Stall auto trait assembly in new solver for int/float vars)

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`@rustbot` modify labels: rollup
@bors bors merged commit c30d7e9 into rust-lang:master Apr 10, 2023
@rustbot rustbot added this to the 1.70.0 milestone Apr 10, 2023
@lcnr lcnr deleted the prioritize-env branch April 10, 2023 14:07
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