--- a/test/langtools/tools/javac/switchextra/CaseTest.java	Mon Nov 11 17:43:10 2019 -0800
+++ b/test/langtools/tools/javac/switchextra/CaseTest.java	Tue Nov 12 06:32:13 2019 +0000
@@ -137,7 +137,7 @@
 
         StringWriter out = new StringWriter();
         JavacTask ct = (JavacTask) tool.getTask(out, null, noErrors,
-            List.of("-XDdev", "--enable-preview", "-source", sourceVersion), null,
+            List.of("-XDdev"), null,
             Arrays.asList(new MyFileObject(code)));
         return ct.parse().iterator().next();
     }