From 561e3cede26b1f222788ddea2106346c4eeaca35 Mon Sep 17 00:00:00 2001 From: lcnr Date: Fri, 24 Oct 2025 14:59:54 +0200 Subject: [PATCH] gamer --- .../src/solve/eval_ctxt/mod.rs | 30 ------------------- .../fixpoint-exponential-growth.stderr | 1 - 2 files changed, 31 deletions(-) diff --git a/compiler/rustc_next_trait_solver/src/solve/eval_ctxt/mod.rs b/compiler/rustc_next_trait_solver/src/solve/eval_ctxt/mod.rs index f72bd1b8c2683..8d0a3ac94d5a3 100644 --- a/compiler/rustc_next_trait_solver/src/solve/eval_ctxt/mod.rs +++ b/compiler/rustc_next_trait_solver/src/solve/eval_ctxt/mod.rs @@ -1308,36 +1308,6 @@ where }, ); - // HACK: We bail with overflow if the response would have too many non-region - // inference variables. This tends to only happen if we encounter a lot of - // ambiguous alias types which get replaced with fresh inference variables - // during generalization. This prevents hangs caused by an exponential blowup, - // see tests/ui/traits/next-solver/coherence-alias-hang.rs. - match self.current_goal_kind { - // We don't do so for `NormalizesTo` goals as we erased the expected term and - // bailing with overflow here would prevent us from detecting a type-mismatch, - // causing a coherence error in diesel, see #131969. We still bail with overflow - // when later returning from the parent AliasRelate goal. - CurrentGoalKind::NormalizesTo => {} - CurrentGoalKind::Misc | CurrentGoalKind::CoinductiveTrait => { - let num_non_region_vars = canonical - .variables - .iter() - .filter(|c| !c.is_region() && c.is_existential()) - .count(); - if num_non_region_vars > self.cx().recursion_limit() { - debug!(?num_non_region_vars, "too many inference variables -> overflow"); - return Ok(self.make_ambiguous_response_no_constraints( - MaybeCause::Overflow { - suggest_increasing_limit: true, - keep_constraints: false, - }, - OpaqueTypesJank::AllGood, - )); - } - } - } - Ok(canonical) } diff --git a/tests/ui/traits/next-solver/cycles/coinduction/fixpoint-exponential-growth.stderr b/tests/ui/traits/next-solver/cycles/coinduction/fixpoint-exponential-growth.stderr index 150100f2c531c..8d7d8cee08ae3 100644 --- a/tests/ui/traits/next-solver/cycles/coinduction/fixpoint-exponential-growth.stderr +++ b/tests/ui/traits/next-solver/cycles/coinduction/fixpoint-exponential-growth.stderr @@ -4,7 +4,6 @@ error[E0275]: overflow evaluating the requirement `W<_>: Trait` LL | impls::>(); | ^^^^ | - = help: consider increasing the recursion limit by adding a `#![recursion_limit = "256"]` attribute to your crate (`fixpoint_exponential_growth`) note: required by a bound in `impls` --> $DIR/fixpoint-exponential-growth.rs:30:13 |