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more eagerly discard constraints on overflow #130273

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merged 1 commit into from
Sep 12, 2024

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@lcnr lcnr commented Sep 12, 2024

We always discard the results of overflowing goals inside of the trait solver. We previously did so when instantiating the response in evaluate_goal. Canonicalizing results only to later discard them is also inefficient 🤷

It's simpler and nicer to debug to eagerly discard constraints inside of the query itself.

r? @compiler-errors

@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 (-Znext-solver) labels Sep 12, 2024
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rustbot commented Sep 12, 2024

Some changes occurred to the core trait solver

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

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@bors r+ rollup

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bors commented Sep 12, 2024

📌 Commit 675c99f 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-review Status: Awaiting review from the assignee but also interested parties. labels Sep 12, 2024
matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request Sep 12, 2024
…mpiler-errors

more eagerly discard constraints on overflow

We always discard the results of overflowing goals inside of the trait solver. We previously did so when instantiating the response in `evaluate_goal`. Canonicalizing results only to later discard them is also  inefficient 🤷

It's simpler and nicer to debug to eagerly discard constraints inside of the query itself.

r? `@compiler-errors`
bors added a commit to rust-lang-ci/rust that referenced this pull request Sep 12, 2024
…iaskrgr

Rollup of 5 pull requests

Successful merges:

 - rust-lang#130101 (some const cleanup: remove unnecessary attributes, add const-hack indications)
 - rust-lang#130208 (Introduce `'ra` lifetime name.)
 - rust-lang#130263 (coverage: Simplify creation of sum counters)
 - rust-lang#130273 (more eagerly discard constraints on overflow)
 - rust-lang#130276 (Add test for nalgebra hang in coherence)

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit cb1d80d into rust-lang:master Sep 12, 2024
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@rustbot rustbot added this to the 1.83.0 milestone Sep 12, 2024
rust-timer added a commit to rust-lang-ci/rust that referenced this pull request Sep 12, 2024
Rollup merge of rust-lang#130273 - lcnr:overflow-no-constraints, r=compiler-errors

more eagerly discard constraints on overflow

We always discard the results of overflowing goals inside of the trait solver. We previously did so when instantiating the response in `evaluate_goal`. Canonicalizing results only to later discard them is also  inefficient 🤷

It's simpler and nicer to debug to eagerly discard constraints inside of the query itself.

r? ``@compiler-errors``
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4 participants