inference: ensure primitive -> boxed conversion won't end with pre-generics jdk (IDEA-154108)

java/java-tests/testData/codeInsight/multipleJdks/java8/p/BoxedTypesWhenPreGenericJDKPresentInProject.java

@@ -0,0 +1,10 @@
+import java.io.File;
+import java.util.Arrays;
+import java.util.Comparator;
+
+class Test {
+  private static File findLastModified(final File[] files) {
+    return Arrays.stream(files).sorted(Comparator.comparing(File::lastModified).reversed())
+      .findFirst().orElse(null);
+  }
+}