Support visit_and in Visitor

Author: st0012

lib/syntax_tree/field_visitor.rb

@@ -73,6 +73,15 @@ def visit_alias(node)
         end
       end
 
+      def visit_and(node)
+        node(node, "and") do
+          field("left", node.left)
+          text("operator", node.operator)
+          field("right", node.right)
+          comments(node)
+        end
+      end
+
       def visit_arg_block(node)
         node(node, "arg_block") do
           field("value", node.value) if node.value

lib/syntax_tree/visitor.rb

@@ -14,6 +14,9 @@ class Visitor < BasicVisitor
     # Visit an AliasNode node.
     alias visit_alias visit_child_nodes
 
+    # Visit an AndNode node.
+    alias visit_and visit_child_nodes
+
     # Visit an ArgBlock node.
     alias visit_arg_block visit_child_nodes