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Fix query cycle when encounter unevaluated const #148698

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Fix query cycle when encounter unevaluated const #148698

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@tiif tiif commented Nov 8, 2025

Fixes rust-lang/trait-system-refactor-initiative#249

In this PR, the environment is dropped when evaluating const that does not have any generic parameter to fix the query cycle.

@rustbot rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. 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 Nov 8, 2025
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tiif commented Nov 8, 2025 •
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I didn't do this for the GCE and RepeatExprCount path above for now because I don't think they will have the same query cycle problem? 🤔 If that should be done, feel free to let me know, and it'd be nice to have test for those paths too.

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tiif commented Nov 8, 2025

r? @BoxyUwU

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@tiif tiif marked this pull request as ready for review November 8, 2025 16:31
@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Nov 8, 2025
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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)

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unevaluated consts in param_env query cycle

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