diff -r 32d957185656 src/java.base/share/classes/sun/util/locale/LocaleMatcher.java
--- a/src/java.base/share/classes/sun/util/locale/LocaleMatcher.java	Thu Sep 15 17:15:54 2016 +0000
+++ b/src/java.base/share/classes/sun/util/locale/LocaleMatcher.java	Fri Sep 30 17:39:42 2016 +0100
@@ -547,10 +547,11 @@
                 return new String[] {range.replaceFirst(r, equiv)};
             } else if (LocaleEquivalentMaps.multiEquivsMap.containsKey(r)) {
                 String[] equivs = LocaleEquivalentMaps.multiEquivsMap.get(r);
+                String[] result = new String[equivs.length];
                 for (int i = 0; i < equivs.length; i++) {
-                    equivs[i] = range.replaceFirst(r, equivs[i]);
+                    result[i] = range.replaceFirst(r, equivs[i]);
                 }
-                return equivs;
+                return result;
             }
 
             // Truncate the last subtag simply.