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

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@@ -83,11 +83,14 @@
 
     /** 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");
+    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);

@@ -134,10 +137,11 @@
     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;

@@ -180,14 +184,14 @@
         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);
+        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;
         }

@@ -268,10 +272,12 @@
             return RELEASE_10;
         case JDK11:
             return RELEASE_11;
         case JDK12:
             return RELEASE_12;
+        case JDK13:
+            return RELEASE_13;
         default:
             return null;
         }
     }
 }
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