--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/langtools/tools/javac/patterns/DuplicateBindingTest.java Wed Nov 27 09:00:01 2019 +0100
@@ -0,0 +1,22 @@
+/*
+ * @test /nodynamiccopyright/
+ * @bug 8231827
+ * @summary Basic pattern bindings scope test
+ * @compile/fail/ref=DuplicateBindingTest.out -XDrawDiagnostics --enable-preview -source ${jdk.version} DuplicateBindingTest.java
+ */
+
+public class DuplicateBindingTest {
+
+ int f;
+
+ public static void main(String[] args) {
+
+ if (args != null) {
+ int s;
+ if (args[0] instanceof String s) { // NOT OK. Redef same scope.
+ }
+ if (args[0] instanceof String f) { // OK to redef field.
+ }
+ }
+ }
+}