fix order of pops

slightly embarrassingly was popping (from the end)
rather than shifting (from the start)

lib/mom/statement.rb

@@ -2,7 +2,7 @@ module Mom
   class Statement
     # flattening will change the structure from a tree to a linked list (and use
     # nekst to do so)
-    def flatten
+    def flatten(options = {})
       raise "not implemented for #{self}"
     end
   end
@@ -11,9 +11,9 @@ module Mom
     include Common::Statements
 
     def flatten( options = {} )
-      flat = @statements.pop.flatten
-      while( nekst = @statements.pop )
-        flat.append nekst.flatten()
+      flat = @statements.shift.flatten(options)
+      while( nekst = @statements.shift )
+        flat.append nekst.flatten(options)
       end
       flat
     end

test/mom/test_if_simple_statement.rb

@@ -23,7 +23,7 @@ module Mom
       assert_equal 7 , @stats.length
     end
     def test_array
-      check_array [SlotMove,TruthCheck,Label,MessageSetup,SimpleCall,ArgumentTransfer,Label], @stats
+      check_array [SlotMove,TruthCheck,Label,MessageSetup,ArgumentTransfer,SimpleCall,Label], @stats
     end
   end
 end

test/mom/test_if_statement.rb

@@ -24,7 +24,7 @@ module Mom
       assert_equal 11 , @stats.length
     end
     def test_array
-      check_array [SlotMove,TruthCheck,Label,SimpleCall,ArgumentTransfer,MessageSetup,Label,SimpleCall,ArgumentTransfer,MessageSetup,Label] , @stats
+      check_array [SlotMove,TruthCheck,Label,MessageSetup,ArgumentTransfer,SimpleCall,Label,MessageSetup,ArgumentTransfer,SimpleCall,Label] , @stats
     end
   end
 end