--- old/test/langtools/tools/javac/switchexpr/CRT.java	2018-12-05 13:52:18.208387527 -0800
+++ new/test/langtools/tools/javac/switchexpr/CRT.java	2018-12-05 13:52:17.996493520 -0800
@@ -151,7 +151,7 @@
         new JavacTask(tb)
                 .options("-Xjcov",
                          "--enable-preview",
-                         "-source", "12")
+                         "-source", "13")
                 .outdir(classes)
                 .sources("public class Test {\n" +
                          code +