Auto merge of #90423 - Aaron1011:deduplicate-projection, r=jackh726
Deduplicate projection sub-obligations
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1 changed files with 6 additions and 0 deletions
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@ -20,6 +20,7 @@ use super::{Normalized, NormalizedTy, ProjectionCacheEntry, ProjectionCacheKey};
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use crate::infer::type_variable::{TypeVariableOrigin, TypeVariableOriginKind};
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use crate::infer::{InferCtxt, InferOk, LateBoundRegionConversionTime};
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use crate::traits::error_reporting::InferCtxtExt as _;
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use rustc_data_structures::sso::SsoHashSet;
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use rustc_data_structures::stack::ensure_sufficient_stack;
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use rustc_errors::ErrorReported;
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use rustc_hir::def_id::DefId;
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@ -944,9 +945,14 @@ fn opt_normalize_projection_type<'a, 'b, 'tcx>(
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Normalized { value: projected_ty, obligations: projected_obligations }
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};
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let mut deduped: SsoHashSet<_> = Default::default();
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let mut canonical =
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SelectionContext::with_query_mode(selcx.infcx(), TraitQueryMode::Canonical);
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result.obligations.drain_filter(|projected_obligation| {
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if !deduped.insert(projected_obligation.clone()) {
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return true;
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}
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// If any global obligations always apply, considering regions, then we don't
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// need to include them. The `is_global` check rules out inference variables,
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// so there's no need for the caller of `opt_normalize_projection_type`
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