diff -r 88502b1cf76f -r 7799a51dbe30 src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/Gen.java
--- a/src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/Gen.java	Mon Sep 09 11:43:16 2019 -0400
+++ b/src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/Gen.java	Wed Nov 27 09:00:01 2019 +0100
@@ -2216,7 +2216,7 @@
     public void visitTypeTest(JCInstanceOf tree) {
         genExpr(tree.expr, tree.expr.type).load();
         setTypeAnnotationPositions(tree.pos);
-        code.emitop2(instanceof_, makeRef(tree.pos(), tree.clazz.type));
+        code.emitop2(instanceof_, makeRef(tree.pos(), tree.pattern.type));
         result = items.makeStackItem(syms.booleanType);
     }