unchecked casts: ignore extends wildcards with the same bound as corresponding type parameter bound (IDEA-71629)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/genericsHighlighting/UncheckedCasts.java

@@ -55,4 +55,18 @@ class M {
   public static <T extends K> L f(T t) {
      return (L) t; //this should NOT generate unchecked cast
   }
-}
+}
+
+class UncheckedCastFalsePositive {
+
+    public static void method(Object something) {
+        if (something instanceof NumberList) {
+            NumberList<? extends Number> <warning descr="Variable 'numberList' is never used">numberList</warning> = (NumberList<?  extends Number>) something;
+        }
+
+    }
+
+    public static class NumberList<E extends Number> extends ArrayList<E> {
+    }
+
+}