--- old/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/ArgumentAttr.java	2018-08-01 08:09:02.787826097 +0200
+++ new/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/ArgumentAttr.java	2018-08-01 08:09:02.495826111 +0200
@@ -480,9 +480,7 @@
         @Override
         Type overloadCheck(ResultInfo resultInfo, DeferredAttrContext deferredAttrContext) {
             ResultInfo localInfo = resultInfo.dup(attr.conditionalContext(resultInfo.checkContext));
-            if (speculativeTree.isStandalone()) {
-                return localInfo.check(speculativeTree, speculativeTree.type);
-            } else if (resultInfo.pt.hasTag(VOID)) {
+            if (resultInfo.pt.hasTag(VOID)) {
                 //this means we are returning a poly switch expression from void-compatible lambda expression
                 resultInfo.checkContext.report(tree, attr.diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid));
                 return attr.types.createErrorType(resultInfo.pt);