src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Attr.java

rev 56510 : 8232684: Make switch expressions final
Reviewed-by: TBD

@@ -1484,11 +1484,10 @@
 
             // Attribute all cases and
             // check that there are no duplicate case labels or default clauses.
             Set<Object> labels = new HashSet<>(); // The set of case labels.
             boolean hasDefault = false;      // Is there a default label?
-            @SuppressWarnings("preview")
             CaseTree.CaseKind caseKind = null;
             boolean wasError = false;
             for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
                 JCCase c = l.head;
                 if (caseKind == null) {