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

*** 83,93 ****
  
      /** 1.11 local-variable syntax for lambda parameters */
      JDK11("11"),
  
      /** 12 covers the to be determined language features that will be added in JDK 12. */
!     JDK12("12");
  
      private static final Context.Key<Source> sourceKey = new Context.Key<>();
  
      public static Source instance(Context context) {
          Source instance = context.get(sourceKey);
--- 83,96 ----
  
      /** 1.11 local-variable syntax for lambda parameters */
      JDK11("11"),
  
      /** 12 covers the to be determined language features that will be added in JDK 12. */
!     JDK12("12"),
! 
!     /** 13 covers the to be determined language features that will be added in JDK 13. */
!     JDK13("13");
  
      private static final Context.Key<Source> sourceKey = new Context.Key<>();
  
      public static Source instance(Context context) {
          Source instance = context.get(sourceKey);
*** 134,143 ****
--- 137,147 ----
      public boolean isSupported() {
          return this.compareTo(MIN) >= 0;
      }
  
      public Target requiredTarget() {
+         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;
          if (this.compareTo(JDK9) >= 0) return Target.JDK1_9;
          if (this.compareTo(JDK8) >= 0) return Target.JDK1_8;
*** 180,193 ****
          UNDERSCORE_IDENTIFIER(MIN, JDK8),
          PRIVATE_INTERFACE_METHODS(JDK9, Fragments.FeaturePrivateIntfMethods, DiagKind.PLURAL),
          LOCAL_VARIABLE_TYPE_INFERENCE(JDK10),
          VAR_SYNTAX_IMPLICIT_LAMBDAS(JDK11, Fragments.FeatureVarSyntaxInImplicitLambda, DiagKind.PLURAL),
          IMPORT_ON_DEMAND_OBSERVABLE_PACKAGES(JDK1_2, JDK8),
!         SWITCH_MULTIPLE_CASE_LABELS(JDK12, Fragments.FeatureMultipleCaseLabels, DiagKind.PLURAL),
!         SWITCH_RULE(JDK12, Fragments.FeatureSwitchRules, DiagKind.PLURAL),
!         SWITCH_EXPRESSION(JDK12, Fragments.FeatureSwitchExpressions, DiagKind.PLURAL),
!         RAW_STRING_LITERALS(JDK12, Fragments.FeatureRawStringLiterals, DiagKind.PLURAL);
  
          enum DiagKind {
              NORMAL,
              PLURAL;
          }
--- 184,197 ----
          UNDERSCORE_IDENTIFIER(MIN, JDK8),
          PRIVATE_INTERFACE_METHODS(JDK9, Fragments.FeaturePrivateIntfMethods, DiagKind.PLURAL),
          LOCAL_VARIABLE_TYPE_INFERENCE(JDK10),
          VAR_SYNTAX_IMPLICIT_LAMBDAS(JDK11, Fragments.FeatureVarSyntaxInImplicitLambda, DiagKind.PLURAL),
          IMPORT_ON_DEMAND_OBSERVABLE_PACKAGES(JDK1_2, JDK8),
!         SWITCH_MULTIPLE_CASE_LABELS(JDK13, Fragments.FeatureMultipleCaseLabels, DiagKind.PLURAL),
!         SWITCH_RULE(JDK13, Fragments.FeatureSwitchRules, DiagKind.PLURAL),
!         SWITCH_EXPRESSION(JDK13, Fragments.FeatureSwitchExpressions, DiagKind.PLURAL),
!         RAW_STRING_LITERALS(JDK13, Fragments.FeatureRawStringLiterals, DiagKind.PLURAL);
  
          enum DiagKind {
              NORMAL,
              PLURAL;
          }
*** 268,277 ****
--- 272,283 ----
              return RELEASE_10;
          case JDK11:
              return RELEASE_11;
          case JDK12:
              return RELEASE_12;
+         case JDK13:
+             return RELEASE_13;
          default:
              return null;
          }
      }
  }