dyn* through more typechecking and MIR

compiler/rustc_const_eval/src/transform/check_consts/check.rs

@@ -546,6 +546,10 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
                 // Since no pointer can ever get exposed (rejected above), this is easy to support.
             }
 
+            Rvalue::Cast(CastKind::DynStar, _, _) => {
+                unimplemented!()
+            }
+
             Rvalue::Cast(CastKind::Misc, _, _) => {}
 
             Rvalue::NullaryOp(NullOp::SizeOf | NullOp::AlignOf, _) => {}

compiler/rustc_const_eval/src/transform/validate.rs

@@ -569,6 +569,9 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> {
                             );
                         }
                     }
+                    CastKind::DynStar => {
+                        // FIXME: make sure nothing needs to be done here.
+                    }
                     // Nothing to check here
                     CastKind::PointerFromExposedAddress
                     | CastKind::PointerExposeAddress