wrapping root array as class ExpressionList

lib/ast/expression.rb

@@ -35,3 +35,4 @@ require_relative "module_expression"
 require_relative "operator_expressions"
 require_relative "return_expression"
 require_relative "while_expression"
+require_relative "expression_list"

lib/ast/expression_list.rb

@@ -0,0 +1,18 @@
+module Ast
+  class ExpressionList < Expression
+    attr_reader  :expressions
+    def initialize expressions
+      @expressions = expressions
+    end
+    def attributes
+      [:expressions]
+    end
+    def inspect
+      self.class.name + ".new( ["+ expressions.collect(&:inspect).join( ",") +"])"
+    end
+
+    def to_s
+      expressions.collect(&:inspect).join("\n")
+    end
+  end
+end