errooaaar~

compiler/rustc_trait_selection/src/traits/select/mod.rs

@@ -34,6 +34,7 @@ use rustc_hir::def_id::DefId;
 use rustc_hir::Constness;
 use rustc_infer::infer::LateBoundRegionConversionTime;
 use rustc_middle::dep_graph::{DepKind, DepNodeIndex};
+use rustc_middle::mir::abstract_const::NotConstEvaluatable;
 use rustc_middle::mir::interpret::ErrorHandled;
 use rustc_middle::ty::fast_reject;
 use rustc_middle::ty::print::with_no_trimmed_paths;
@@ -547,7 +548,8 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                         obligation.cause.span,
                     ) {
                         Ok(()) => Ok(EvaluatedToOk),
-                        Err(ErrorHandled::TooGeneric) => Ok(EvaluatedToAmbig),
+                        Err(NotConstEvaluatable::MentionsInfer) => Ok(EvaluatedToAmbig),
+                        Err(NotConstEvaluatable::MentionsParam) => Ok(EvaluatedToErr),
                         Err(_) => Ok(EvaluatedToErr),
                     }
                 }