Delay a bug when encountering an impl with unconstrained generics in codegen_select
#133368
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
|
r? @wesleywiser rustbot has assigned @wesleywiser. Use |
rustbot
added
S-waiting-on-review
compiler-errors
commented
Nov 23, 2024
| // for this and will in fact ICE in stable hashing of the return value. So bail out instead. | ||
| infcx.tcx.dcx().has_errors().unwrap(); | ||
| let impl_source = tcx.erase_regions(impl_source); | ||
| if impl_source.has_non_region_infer() { |
There was a problem hiding this comment.
this is a drive by to make it clear what it's looking for. no functional change.
bors
added
S-waiting-on-bors
bors
added a commit
to rust-lang-ci/rust
that referenced
this pull request
Nov 28, 2024
…llaumeGomez Rollup of 12 pull requests Successful merges: - rust-lang#129409 (Expand std::os::unix::fs::chown() doc with a warning) - rust-lang#133320 (Add release notes for Rust 1.83.0) - rust-lang#133368 (Delay a bug when encountering an impl with unconstrained generics in `codegen_select`) - rust-lang#133428 (Actually use placeholder regions for trait method late bound regions in `collect_return_position_impl_trait_in_trait_tys`) - rust-lang#133512 (Add `as_array` and `as_mut_array` conversion methods to slices.) - rust-lang#133519 (Check `xform_ret_ty` for WF in the new solver to improve method winnowing) - rust-lang#133520 (Structurally resolve before applying projection in borrowck) - rust-lang#133534 (extend group-forbid-always-trumps-cli test) - rust-lang#133537 ([rustdoc] Fix new clippy lints) - rust-lang#133543 ([AIX] create shim for lgammaf_r) - rust-lang#133547 (rustc_span: Replace a `HashMap<_, ()>` with `HashSet`) - rust-lang#133550 (print generated doc paths) r? `@ghost` `@rustbot` modify labels: rollup
rust-timer
added a commit
to rust-lang-ci/rust
that referenced
this pull request
Nov 28, 2024
Rollup merge of rust-lang#133368 - compiler-errors:codegen-select-unconstrained-params, r=lcnr Delay a bug when encountering an impl with unconstrained generics in `codegen_select` Despite its name, `codegen_select` is what powers `Instance::try_resolve`, which is used in pre-codegen contexts to try to resolve a method where possible. One place that it's used is in the "recursion MIR lint" that detects recursive MIR bodies. If we encounter an impl in `codegen_select` that contains unconstrained generic parameters, we expect that impl to caused an error to be reported; however, there's no temporal guarantee that this error is reported *before* we call `codegen_select`. This is what a delayed bug is *for*, and this PR makes us use a delayed bug rather than asserting something about errors already having been emitted. Fixes rust-lang#126646
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Despite its name,
codegen_selectis what powersInstance::try_resolve, which is used in pre-codegen contexts to try to resolve a method where possible. One place that it's used is in the "recursion MIR lint" that detects recursive MIR bodies.If we encounter an impl in
codegen_selectthat contains unconstrained generic parameters, we expect that impl to caused an error to be reported; however, there's no temporal guarantee that this error is reported before we callcodegen_select. This is what a delayed bug is for, and this PR makes us use a delayed bug rather than asserting something about errors already having been emitted.Fixes #126646