--- old/src/jdk.compiler/share/classes/com/sun/tools/javac/code/Source.java	2019-12-02 22:13:25.636111999 -0800
+++ new/src/jdk.compiler/share/classes/com/sun/tools/javac/code/Source.java	2019-12-02 22:13:25.472029999 -0800
@@ -96,7 +96,12 @@
     /**
      * 14, switch expressions
      */
-    JDK14("14");
+    JDK14("14"),
+
+    /**
+     * 15, tbd
+     */
+    JDK15("15");
 
     private static final Context.Key<Source> sourceKey = new Context.Key<>();
 
@@ -147,6 +152,7 @@
     }
 
     public Target requiredTarget() {
+        if (this.compareTo(JDK15) >= 0) return Target.JDK1_15;
         if (this.compareTo(JDK14) >= 0) return Target.JDK1_14;
         if (this.compareTo(JDK13) >= 0) return Target.JDK1_13;
         if (this.compareTo(JDK12) >= 0) return Target.JDK1_12;
@@ -198,9 +204,9 @@
         SWITCH_MULTIPLE_CASE_LABELS(JDK14, Fragments.FeatureMultipleCaseLabels, DiagKind.PLURAL),
         SWITCH_RULE(JDK14, Fragments.FeatureSwitchRules, DiagKind.PLURAL),
         SWITCH_EXPRESSION(JDK14, Fragments.FeatureSwitchExpressions, DiagKind.PLURAL),
-        TEXT_BLOCKS(JDK14, Fragments.FeatureTextBlocks, DiagKind.PLURAL),
-        PATTERN_MATCHING_IN_INSTANCEOF(JDK14, Fragments.FeaturePatternMatchingInstanceof, DiagKind.NORMAL),
-        REIFIABLE_TYPES_INSTANCEOF(JDK14, Fragments.FeatureReifiableTypesInstanceof, DiagKind.PLURAL),
+        TEXT_BLOCKS(JDK15, Fragments.FeatureTextBlocks, DiagKind.PLURAL),
+        PATTERN_MATCHING_IN_INSTANCEOF(JDK15, Fragments.FeaturePatternMatchingInstanceof, DiagKind.NORMAL),
+        REIFIABLE_TYPES_INSTANCEOF(JDK15, Fragments.FeatureReifiableTypesInstanceof, DiagKind.PLURAL),
         ;
 
         enum DiagKind {
@@ -290,6 +296,8 @@
             return RELEASE_13;
         case JDK14:
             return RELEASE_14;
+        case JDK15:
+            return RELEASE_15;
         default:
             return null;
         }