--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/langtools/tools/javac/patterns/UncheckedWarningOnMatchesTest.java Wed Nov 27 09:00:01 2019 +0100
@@ -0,0 +1,18 @@
+/*
+ * @test /nodynamiccopyright/
+ * @bug 8187429 8231827
+ * @summary Missing unchecked conversion warning
+ * @compile/fail/ref=UncheckedWarningOnMatchesTest.out -Xlint:unchecked -Werror -XDrawDiagnostics --enable-preview -source ${jdk.version} UncheckedWarningOnMatchesTest.java
+ */
+import java.util.ArrayList;
+
+public class UncheckedWarningOnMatchesTest {
+
+ public static void main(String [] args) {
+
+ Object o = new ArrayList<UncheckedWarningOnMatchesTest>();
+ if (o instanceof ArrayList<Integer> ai) { // unchecked conversion
+ System.out.println("Blah");
+ }
+ }
+}