1 files changed, 1 insertions, 12 deletions
diff --git a/compiler/rustc_trait_selection/src/traits/query/evaluate_obligation.rs b/compiler/rustc_trait_selection/src/traits/query/evaluate_obligation.rs
index a50644bb7..65f32b1c4 100644
--- a/compiler/rustc_trait_selection/src/traits/query/evaluate_obligation.rs
+++ b/compiler/rustc_trait_selection/src/traits/query/evaluate_obligation.rs
@@ -1,5 +1,4 @@
 use rustc_infer::traits::{TraitEngine, TraitEngineExt};
-use rustc_middle::ty;
 
 use crate::infer::canonical::OriginalQueryValues;
 use crate::infer::InferCtxt;
@@ -66,17 +65,7 @@ impl<'tcx> InferCtxtExt<'tcx> for InferCtxt<'tcx> {
     ) -> Result<EvaluationResult, OverflowError> {
         let mut _orig_values = OriginalQueryValues::default();
 
-        let param_env = match obligation.predicate.kind().skip_binder() {
-            ty::PredicateKind::Clause(ty::ClauseKind::Trait(pred)) => {
-                // we ignore the value set to it.
-                let mut _constness = pred.constness;
-                obligation
-                    .param_env
-                    .with_constness(_constness.and(obligation.param_env.constness()))
-            }
-            // constness has no effect on the given predicate.
-            _ => obligation.param_env.without_const(),
-        };
+        let param_env = obligation.param_env;
 
         if self.next_trait_solver() {
             self.probe(|snapshot| {