diff --git a/lib/ast/basic_expressions.rb b/lib/ast/basic_expressions.rb
index 69e6d085..624697d6 100644
--- a/lib/ast/basic_expressions.rb
+++ b/lib/ast/basic_expressions.rb
@@ -10,6 +10,9 @@ module Ast
     def inspect
       self.class.name + ".new(" + value.to_s+ ")"
     end
+    def to_s
+      value.to_s
+    end
     def compile context
       Vm::Signed.new value
     end
@@ -31,6 +34,9 @@ module Ast
     def inspect
       self.class.name + '.new("' + name + '")'
     end
+    def to_s
+      name
+    end
     def attributes
       [:name]
     end
diff --git a/lib/ast/function_expression.rb b/lib/ast/function_expression.rb
index 144b9a66..4b57e5d8 100644
--- a/lib/ast/function_expression.rb
+++ b/lib/ast/function_expression.rb
@@ -13,7 +13,11 @@ module Ast
         block.collect{|m| m.inspect }.join( ",") +"] )"  
     end
     
+    def to_s
+      "def #{name}( " + params.join(",") + ") \n" + block.join("\n") + "end\n"
+    end
     def compile context
+      raise self.to_s
       parent_locals = context.locals
       context.locals = {}
       args = []
diff --git a/lib/ast/operator_expressions.rb b/lib/ast/operator_expressions.rb
index 21a7e16d..1793a365 100644
--- a/lib/ast/operator_expressions.rb
+++ b/lib/ast/operator_expressions.rb
@@ -7,7 +7,6 @@ module Ast
     def initialize name, args
       @name , @args = name , args
     end
-  
     def compile context
       fun = Vm::FunctionCall.new( name , args.collect{ |a| a.compile(context) } )
       fun.assign_function context
@@ -19,7 +18,9 @@ module Ast
       self.class.name + ".new(" + name.inspect + ", ["+ 
         args.collect{|m| m.inspect }.join( ",") +"] )"  
     end
-  
+    def to_s
+      "#{name}(" + args.join(",") + ")"
+    end
     def attributes
       [:name , :args]
     end
@@ -37,7 +38,9 @@ module Ast
     def inspect
       self.class.name + ".new(" + operator.inspect + ", " +  left.inspect + "," + right.inspect + ")"  
     end
-  
+    def to_s
+      "#{left} #{operator} #{right}"
+    end
     def compile context
       parent_locals = context.locals
       context.locals = {}
diff --git a/lib/ast/while_expression.rb b/lib/ast/while_expression.rb
index c78953f1..e20e4def 100644
--- a/lib/ast/while_expression.rb
+++ b/lib/ast/while_expression.rb
@@ -7,6 +7,9 @@ module Ast
     def inspect
       self.class.name + ".new(" + condition.inspect + ", "  + body.inspect + " )"  
     end
+    def to_s
+      "while(#{condition}) do\n" + body.join("\n") + "\nend\n"
+    end
     def attributes
       [:condition, :body]
     end