Complete AST nodes for switch statement.

dart/frog/leg/tree/unparser.dart

Index: dart/frog/leg/tree/unparser.dart
diff --git a/dart/frog/leg/tree/unparser.dart b/dart/frog/leg/tree/unparser.dart
index 7b208bf61378a7181615b06db342535edbe755b7..480ef657477986710d13e28b340d49f09e210c0f 100644
--- a/dart/frog/leg/tree/unparser.dart
+++ b/dart/frog/leg/tree/unparser.dart
@@ -324,8 +324,30 @@ class Unparser implements Visitor {
     add(node.switchKeyword.value);
     sb.add(' ');
     visit(node.parenthesizedExpression);
-    sb.add(' { /* NOT IMPLEMENTED YET */ }');
-    // TODO(ahe): More to come...
+    sb.add(' ');
+    visit(node.cases);
+  }
+
+  visitSwitchCase(SwitchCase node) {
+    if (node.label !== null) {
+      visit(node.label);
+      sb.add(': ');
+    }
+    node.caseKeyword.value.printOn(sb);
+    sb.add(' ');
+    visit(node.expression);
+    sb.add(': ');
+    visit(node.statements);
+  }
+
+  visitDefaultCase(DefaultCase node) {
+    if (node.label !== null) {
+      visit(node.label);
+      sb.add(': ');
+    }
+    node.defaultKeyword.value.printOn(sb);
+    sb.add(': ');
+    visit(node.statements);
   }
 
   visitScriptTag(ScriptTag node) {