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test/langtools/tools/javac/switchexpr/BreakTest.java

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rev 56806 : 8232684: Make switch expressions final
Reviewed-by: TBD


  50             "            case null: i++; break LABEL;" +
  51             "            default: i++; break;" +
  52             "        }" +
  53             "    }" +
  54             "    int t2(Integer i) {" +
  55             "        return switch (i) {" +
  56             "            case null: break LABEL;" +
  57             "            default: yield 2;" +
  58             "        }" +
  59             "    }" +
  60             "}";
  61 
  62     public static void main(String[] args) throws Exception {
  63         final JavaCompiler tool = ToolProvider.getSystemJavaCompiler();
  64         String sourceVersion = Integer.toString(Runtime.version().feature());
  65         assert tool != null;
  66         DiagnosticListener<JavaFileObject> noErrors = d -> {};
  67 
  68         StringWriter out = new StringWriter();
  69         JavacTask ct = (JavacTask) tool.getTask(out, null, noErrors,
  70             List.of("-XDdev", "--enable-preview", "-source", sourceVersion), null,
  71             Arrays.asList(new MyFileObject(CODE)));
  72         List<String> labels = new ArrayList<>();
  73         new TreePathScanner<Void, Void>() {
  74             @Override
  75             public Void visitBreak(BreakTree node, Void p) {
  76                 Name label = node.getLabel();
  77                 labels.add(label != null ? label.toString() : null);
  78                 return super.visitBreak(node, p);
  79             }
  80         }.scan(ct.parse(), null);
  81 
  82         List<String> expected = Arrays.asList("LABEL", null, "LABEL");
  83 
  84         if (!expected.equals(labels)) {
  85             throw new AssertionError("Unexpected labels found: " + labels);
  86         }
  87     }
  88 
  89     static class MyFileObject extends SimpleJavaFileObject {
  90         private String text;


  50             "            case null: i++; break LABEL;" +
  51             "            default: i++; break;" +
  52             "        }" +
  53             "    }" +
  54             "    int t2(Integer i) {" +
  55             "        return switch (i) {" +
  56             "            case null: break LABEL;" +
  57             "            default: yield 2;" +
  58             "        }" +
  59             "    }" +
  60             "}";
  61 
  62     public static void main(String[] args) throws Exception {
  63         final JavaCompiler tool = ToolProvider.getSystemJavaCompiler();
  64         String sourceVersion = Integer.toString(Runtime.version().feature());
  65         assert tool != null;
  66         DiagnosticListener<JavaFileObject> noErrors = d -> {};
  67 
  68         StringWriter out = new StringWriter();
  69         JavacTask ct = (JavacTask) tool.getTask(out, null, noErrors,
  70             List.of("-XDdev"), null,
  71             Arrays.asList(new MyFileObject(CODE)));
  72         List<String> labels = new ArrayList<>();
  73         new TreePathScanner<Void, Void>() {
  74             @Override
  75             public Void visitBreak(BreakTree node, Void p) {
  76                 Name label = node.getLabel();
  77                 labels.add(label != null ? label.toString() : null);
  78                 return super.visitBreak(node, p);
  79             }
  80         }.scan(ct.parse(), null);
  81 
  82         List<String> expected = Arrays.asList("LABEL", null, "LABEL");
  83 
  84         if (!expected.equals(labels)) {
  85             throw new AssertionError("Unexpected labels found: " + labels);
  86         }
  87     }
  88 
  89     static class MyFileObject extends SimpleJavaFileObject {
  90         private String text;
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