fix and test function transform without braces

lib/parser/transform.rb

@@ -57,6 +57,11 @@ module Parser
             Ast::FunctionExpression.new(function_name.name, parameter_list, expressions)
           end
 
+    rule(:function_name   => simple(:function_name),
+         :expressions   => sequence(:expressions) , :end => simple(:e)) do
+            Ast::FunctionExpression.new(function_name.name, [], expressions)
+          end
+
     rule(:receiver=> simple(:receiver),
          :function_name   => simple(:function_name),
          :parameter_list => sequence(:parameter_list),

test/roots/test_function_definition.rb

@@ -15,6 +15,17 @@ HERE
     @parser = @parser
   end
 
+  def test_function_no_braces
+    @string_input    = <<HERE
+def foo
+  5
+end
+HERE
+    @parse_output = {:expression_list=>[{:function_name=>{:name=>"foo"}, :expressions=>[{:integer=>"5"}], :end=>"end"}]}
+    @transform_output = Ast::ExpressionList.new( [Ast::FunctionExpression.new(:foo, [] , [Ast::IntegerExpression.new(5)] ,nil )])
+    @parser = @parser
+  end
+
   def test_class_function
     @string_input    = <<HERE
 def String.length(x)