Don't ICE on pending obligations from deep normalization in a loop #140021
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lcnr
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| let mut errors = fulfill_cx.select_all_or_error(self.infcx); | ||
| // Drain pending obligations too, since deep normalization may happen | ||
| // in a loop and we don't want to trigger the assertion on the next | ||
| // iteration due to pending obligations we've left over. | ||
| errors.extend(fulfill_cx.collect_remaining_errors(self.infcx)); |
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hmm, fn select_all_or_error is currently implemented as
fn select_all_or_error(&mut self, infcx: &InferCtxt<'tcx>) -> Vec<E> {
let errors = self.select_where_possible(infcx);
if !errors.is_empty() {
return errors;
}
self.collect_remaining_errors(infcx)
}it feels a bit footgunny to not add the overflowing obligations if there are other errors. I think changing the if errors.is_empty() branch to also add the remaining errors would be better 🤔
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or no, in case select_where_possible returns an error, we want to ignore overflow and ambiguity errors. I think we also want to ignore these ambiguity errors here, so maybe change this to
let errors = fulfill_cx.select_all_or_error(self.infcx);
if errors.is_empty() {
Ok(self.infcx.resolve_vars_if_possible(value))
} else {
// In case normalization resulted in an error, we want to
// drain any still ambiguous goal to avoid triggering the
// assertion on the next iteration.
let _ = fulfill_cx.collect_remaining_errors(self.infcx));
Err(errors)
}There was a problem hiding this comment.
alternatively we could drop the remaining obligations in the !errors.is_empty() branch in select_all_or_error itself? 🤔
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alternatively we could drop the remaining obligations in the
!errors.is_empty()branch inselect_all_or_erroritself? 🤔
Hm, feels like a much larger and more subtle change. I'd rather keep it located to deep normalization.
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or no, in case select_where_possible returns an error, we want to ignore overflow and ambiguity errors. I think we also want to ignore these ambiguity errors here, so maybe change this to [...]
Functionally equivalent to what I have right now, but I guess alright.
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Functionally equivalent to what I have right now, but I guess alright.
Correction -- not functionally equivalent, but doesn't matter for UI tests. I originally had let _ = fulfill_cx.collect_remaining_errors(self.infcx)) on the good path of deep norm too, but it felt spooky. I guess it's fine though.
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…lcnr Don't ICE on pending obligations from deep normalization in a loop See the comment I left inline in `compiler/rustc_trait_selection/src/traits/normalize.rs`. Fixes rust-lang#133868 r? lcnr
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…r=lcnr Don't ICE on pending obligations from deep normalization in a loop See the comment I left inline in `compiler/rustc_trait_selection/src/traits/normalize.rs`. Fixes rust-lang#133868 r? lcnr
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Rollup of 11 pull requests Successful merges: - rust-lang#139795 (Clarify why SGX code specifies linkage/symbol names for certain statics) - rust-lang#139946 (fix missing word in comment) - rust-lang#139982 (SystemTime doc tweaks) - rust-lang#140009 (docs(LocalKey<T>): clarify that T's Drop shouldn't panic) - rust-lang#140021 (Don't ICE on pending obligations from deep normalization in a loop) - rust-lang#140036 (Advent of `tests/ui` (misc cleanups and improvements) [4/N]) - rust-lang#140047 (remove a couple clones) - rust-lang#140052 (Fix error when an intra doc link is trying to resolve an empty associated item) - rust-lang#140074 (rustdoc-json: Improve test for auto-trait impls) - rust-lang#140076 (jsondocck: Require command is at start of line) - rust-lang#140081 (Update `libc` to 0.2.172) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup of 11 pull requests Successful merges: - rust-lang#139795 (Clarify why SGX code specifies linkage/symbol names for certain statics) - rust-lang#139946 (fix missing word in comment) - rust-lang#139982 (SystemTime doc tweaks) - rust-lang#140009 (docs(LocalKey<T>): clarify that T's Drop shouldn't panic) - rust-lang#140021 (Don't ICE on pending obligations from deep normalization in a loop) - rust-lang#140036 (Advent of `tests/ui` (misc cleanups and improvements) [4/N]) - rust-lang#140047 (remove a couple clones) - rust-lang#140052 (Fix error when an intra doc link is trying to resolve an empty associated item) - rust-lang#140074 (rustdoc-json: Improve test for auto-trait impls) - rust-lang#140076 (jsondocck: Require command is at start of line) - rust-lang#140081 (Update `libc` to 0.2.172) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup of 11 pull requests Successful merges: - rust-lang#139795 (Clarify why SGX code specifies linkage/symbol names for certain statics) - rust-lang#139946 (fix missing word in comment) - rust-lang#139982 (SystemTime doc tweaks) - rust-lang#140009 (docs(LocalKey<T>): clarify that T's Drop shouldn't panic) - rust-lang#140021 (Don't ICE on pending obligations from deep normalization in a loop) - rust-lang#140036 (Advent of `tests/ui` (misc cleanups and improvements) [4/N]) - rust-lang#140047 (remove a couple clones) - rust-lang#140052 (Fix error when an intra doc link is trying to resolve an empty associated item) - rust-lang#140074 (rustdoc-json: Improve test for auto-trait impls) - rust-lang#140076 (jsondocck: Require command is at start of line) - rust-lang#140081 (Update `libc` to 0.2.172) r? `@ghost` `@rustbot` modify labels: rollup
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…enton Rollup of 8 pull requests Successful merges: - rust-lang#139946 (fix missing word in comment) - rust-lang#139982 (SystemTime doc tweaks) - rust-lang#140009 (docs(LocalKey<T>): clarify that T's Drop shouldn't panic) - rust-lang#140021 (Don't ICE on pending obligations from deep normalization in a loop) - rust-lang#140029 (Relocate tests in `tests/ui`) - rust-lang#140030 (Fix autodiff debug builds) - rust-lang#140120 (Use `output_base_dir` for `mir_dump_dir`) - rust-lang#140121 (Document why CodeStats::type_sizes is public) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#140021 - compiler-errors:no-deep-norm-ice, r=lcnr Don't ICE on pending obligations from deep normalization in a loop See the comment I left inline in `compiler/rustc_trait_selection/src/traits/normalize.rs`. Fixes rust-lang#133868 r? lcnr
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See the comment I left inline in
compiler/rustc_trait_selection/src/traits/normalize.rs.Fixes #133868
r? lcnr