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-rw-r--r--compiler/rustc_trait_selection/src/traits/mod.rs4
1 files changed, 2 insertions, 2 deletions
diff --git a/compiler/rustc_trait_selection/src/traits/mod.rs b/compiler/rustc_trait_selection/src/traits/mod.rs
index c0603c06d42..80cef690028 100644
--- a/compiler/rustc_trait_selection/src/traits/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/mod.rs
@@ -698,8 +698,8 @@ fn replace_param_and_infer_args_with_placeholder<'tcx>(
 /// used during analysis.
 pub fn impossible_predicates<'tcx>(tcx: TyCtxt<'tcx>, predicates: Vec<ty::Clause<'tcx>>) -> bool {
     debug!("impossible_predicates(predicates={:?})", predicates);
-    let infcx = tcx.infer_ctxt().build(TypingMode::PostAnalysis);
-    let param_env = ty::ParamEnv::reveal_all();
+    let (infcx, param_env) =
+        tcx.infer_ctxt().build_with_typing_env(ty::TypingEnv::fully_monomorphized());
     let ocx = ObligationCtxt::new(&infcx);
     let predicates = ocx.normalize(&ObligationCause::dummy(), param_env, predicates);
     for predicate in predicates {