fibonacci while works just as well now

surprisingly much faster though,

test/compiler/fragments/test_all.rb

@@ -7,4 +7,4 @@ require_relative "test_if"
 require_relative "test_putint"
 require_relative "test_recursive_fibo"
 require_relative "test_return"
-#require_relative "test_while_fibo"
+require_relative "test_while_fibo"

test/compiler/fragments/test_while_fibo.rb

@@ -9,6 +9,7 @@ class Object
   int fibonaccit(int n)
       int a = 0
       int b = 1
+      n = n - 1
       while_plus( n )
         int tmp = a
         a = b
@@ -20,12 +21,14 @@ class Object
   end
 
   int main()
-    fibonaccit( 10 )
+    return fibonaccit( 10 )
   end
 end
 HERE
-    @length = 5
+    @length = 278
     check
+    assert_equal Parfait::Message , @interpreter.get_register(:r1).class
+    assert_equal 55 , @interpreter.get_register(:r1).return_value
   end
 
 end