IDEA-218232 Create missing branch in switch leads to exception, fix all does nothing

GitOrigin-RevId: 136c60845a6b70bca07d5643913f50aaa26e0010

plugins/InspectionGadgets/src/com/siyeh/ig/fixes/CreateMissingSwitchBranchesFix.java

@@ -6,8 +6,10 @@ import com.intellij.codeInsight.template.TemplateBuilderFactory;
 import com.intellij.codeInsight.template.impl.ConstantNode;
 import com.intellij.openapi.editor.Editor;
 import com.intellij.openapi.util.Couple;
+import com.intellij.pom.java.LanguageLevel;
 import com.intellij.psi.*;
 import com.intellij.psi.util.PsiTreeUtil;
+import com.intellij.psi.util.PsiUtil;
 import com.intellij.util.ObjectUtils;
 import com.intellij.util.containers.ContainerUtil;
 import com.siyeh.ig.psiutils.CommentTracker;
@@ -153,7 +155,9 @@ public class CreateMissingSwitchBranchesFix extends BaseSwitchFix {
       if (isRuleBasedFormat) {
         return Collections.singletonList("case " + name + " -> " + value + ";");
       } else {
-        return Arrays.asList("case "+name+":", "break " + value + ";");
+        return Arrays.asList("case " + name + ":",
+                             (PsiUtil.getLanguageLevel(switchBlock) == LanguageLevel.JDK_13_PREVIEW ? "yield" : "break") +
+                             " " + value + ";");
       }
     } else {
       if (isRuleBasedFormat) {

plugins/InspectionGadgets/test/com/siyeh/igfixes/controlflow/enumswitch/afterExpressionBreakJava13Preview.java

@@ -0,0 +1,17 @@
+// "Create missing branches: 'B', and 'C'" "true"
+package com.siyeh.ipp.enumswitch;
+
+class BeforeDefault {
+  enum X {A, B, C}
+  
+  String test(X x) {
+    return switch (x) {
+      case A: yield "foo";
+        case B:
+            yield null;
+        case C:
+            yield null;
+        default: yield "bar";
+    };
+  }
+}

plugins/InspectionGadgets/test/com/siyeh/igfixes/controlflow/enumswitch/beforeExpressionBreakJava13Preview.java

@@ -0,0 +1,13 @@
+// "Create missing branches: 'B', and 'C'" "true"
+package com.siyeh.ipp.enumswitch;
+
+class BeforeDefault {
+  enum X {A, B, C}
+  
+  String test(X x) {
+    return <caret>switch (x) {
+      case A: yield "foo";
+      default: yield "bar";
+    };
+  }
+}