--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/langtools/tools/javac/patterns/PatternVariablesAreFinal.java Wed Nov 27 09:00:01 2019 +0100
@@ -0,0 +1,16 @@
+/*
+ * @test /nodynamiccopyright/
+ * @bug 8231827
+ * @summary Ensure that in type test patterns, the predicate is not trivially provable false.
+ * @compile/fail/ref=PatternVariablesAreFinal.out -XDrawDiagnostics --enable-preview -source ${jdk.version} PatternVariablesAreFinal.java
+ */
+public class PatternVariablesAreFinal {
+ public static void main(String[] args) {
+ Object o = 32;
+ if (o instanceof String s) {
+ s = "hello again";
+ System.out.println(s);
+ }
+ System.out.println("test complete");
+ }
+}