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

*** 94,104 ****
      JDK13("13"),
  
      /**
       * 14, switch expressions
       */
!     JDK14("14");
  
      private static final Context.Key<Source> sourceKey = new Context.Key<>();
  
      public static Source instance(Context context) {
          Source instance = context.get(sourceKey);
--- 94,109 ----
      JDK13("13"),
  
      /**
       * 14, switch expressions
       */
!     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);
*** 145,154 ****
--- 150,160 ----
      public boolean isSupported() {
          return this.compareTo(MIN) >= 0;
      }
  
      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;
          if (this.compareTo(JDK11) >= 0) return Target.JDK1_11;
          if (this.compareTo(JDK10) >= 0) return Target.JDK1_10;
*** 196,208 ****
          VAR_SYNTAX_IMPLICIT_LAMBDAS(JDK11, Fragments.FeatureVarSyntaxInImplicitLambda, DiagKind.PLURAL),
          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(JDK14, Fragments.FeatureTextBlocks, DiagKind.PLURAL),
!         PATTERN_MATCHING_IN_INSTANCEOF(JDK14, Fragments.FeaturePatternMatchingInstanceof, DiagKind.NORMAL),
!         REIFIABLE_TYPES_INSTANCEOF(JDK14, Fragments.FeatureReifiableTypesInstanceof, DiagKind.PLURAL),
          ;
  
          enum DiagKind {
              NORMAL,
              PLURAL;
--- 202,214 ----
          VAR_SYNTAX_IMPLICIT_LAMBDAS(JDK11, Fragments.FeatureVarSyntaxInImplicitLambda, DiagKind.PLURAL),
          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),
          ;
  
          enum DiagKind {
              NORMAL,
              PLURAL;
*** 288,297 ****
--- 294,305 ----
              return RELEASE_12;
          case JDK13:
              return RELEASE_13;
          case JDK14:
              return RELEASE_14;
+         case JDK15:
+             return RELEASE_15;
          default:
              return null;
          }
      }
  }