src/jdk.compiler/share/classes/com/sun/tools/javac/code/Source.java

*** 100,110 ****
      JDK14("14"),
  
      /**
        * 15, tbd
        */
!     JDK15("15");
  
      private static final Context.Key<Source> sourceKey = new Context.Key<>();
  
      public static Source instance(Context context) {
          Source instance = context.get(sourceKey);
--- 100,115 ----
      JDK14("14"),
  
      /**
        * 15, tbd
        */
!     JDK15("15"),
! 
!     /**
!       * 16, tbd
!       */
!     JDK16("16");
  
      private static final Context.Key<Source> sourceKey = new Context.Key<>();
  
      public static Source instance(Context context) {
          Source instance = context.get(sourceKey);
*** 151,160 ****
--- 156,166 ----
      public boolean isSupported() {
          return this.compareTo(MIN) >= 0;
      }
  
      public Target requiredTarget() {
+         if (this.compareTo(JDK16) >= 0) return Target.JDK1_16;
          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;
          if (this.compareTo(JDK11) >= 0) return Target.JDK1_11;
*** 204,216 ****
          IMPORT_ON_DEMAND_OBSERVABLE_PACKAGES(JDK1_2, JDK8),
          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(JDK15, Fragments.FeatureTextBlocks, DiagKind.PLURAL),
!         PATTERN_MATCHING_IN_INSTANCEOF(JDK15, Fragments.FeaturePatternMatchingInstanceof, DiagKind.NORMAL),
!         REIFIABLE_TYPES_INSTANCEOF(JDK15, Fragments.FeatureReifiableTypesInstanceof, DiagKind.PLURAL),
!         RECORDS(JDK15, Fragments.FeatureRecords, DiagKind.PLURAL),
          ;
  
          enum DiagKind {
              NORMAL,
              PLURAL;
--- 210,222 ----
          IMPORT_ON_DEMAND_OBSERVABLE_PACKAGES(JDK1_2, JDK8),
          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(JDK15, Fragments.FeatureTextBlocks, DiagKind.PLURAL),
!         PATTERN_MATCHING_IN_INSTANCEOF(JDK16, Fragments.FeaturePatternMatchingInstanceof, DiagKind.NORMAL),
!         REIFIABLE_TYPES_INSTANCEOF(JDK16, Fragments.FeatureReifiableTypesInstanceof, DiagKind.PLURAL),
!         RECORDS(JDK16, Fragments.FeatureRecords, DiagKind.PLURAL),
          ;
  
          enum DiagKind {
              NORMAL,
              PLURAL;
*** 298,307 ****
--- 304,315 ----
              return RELEASE_13;
          case JDK14:
              return RELEASE_14;
          case JDK15:
              return RELEASE_15;
+         case JDK16:
+             return RELEASE_16;
          default:
              return null;
          }
      }
  }