check for redefining of methods and forbid

causing some test problems, but better that way (until it's done right off course)

test/risc/interpreter/builtin/test_int_math.rb

@@ -5,38 +5,45 @@ module Risc
     class IntMath < Minitest::Test
       include Ticker
       def setup
-        @preload = "all"
       end
 
       def test_add
+        @preload = "Integer.plus"
         run_main_return "5 + 5"
         assert_equal 10 , get_return
       end
       def test_minus
+        @preload = "Integer.minus"
         run_main_return "5 - 5"
         assert_equal 0 , get_return
       end
       def test_minus_neg
+        @preload = "Integer.minus"
         run_main_return "5 - 15"
         assert_equal( -10 , get_return)
       end
       def test_rshift
+        @preload = "Integer.rs"
         run_main_return "#{2**8} >> 3"
         assert_equal 2**5 , get_return
       end
       def test_lshift
+        @preload = "Integer.ls"
         run_main_return "#{2**8} << 3"
         assert_equal 2**11 , get_return
       end
       def test_div10
+        @preload = "Integer.div10"
         run_main_return "45.div10"
         assert_equal 4 , get_return
       end
       def test_div4
+        @preload = "Integer.div4"
         run_main_return "45.div4"
         assert_equal 11 , get_return
       end
       def test_mult
+        @preload = "Integer.mul"
         run_main_return "4 * 4"
         assert_equal 16 , get_return
       end