diff --git a/src/polyfill.lua b/src/polyfill.lua
index 4eed02b..7d2f084 100644
--- a/src/polyfill.lua
+++ b/src/polyfill.lua
@@ -13,10 +13,64 @@ _G.require = function (module)
                     end
                 else
                     print("ERROR: Tell a dev to implement: " .. i)
+                    os.exit()
                 end
              end
         }
         setmetatable(module, metatable)
         return module
     end
+    print("ERROR: Tell a dev to implement: " .. module)
+    os.exit()
+end
+
+-- Polyfill bit. see: http://bitop.luajit.org/api.html
+
+-- Already implemented
+-- bit.band
+-- bit.bnot
+-- bit.bor
+-- bit.bxor
+
+--
+
+bit.tobit = function(x)
+    print("ERROR: Tell a dev to implement: bit.tobi")
+    os.exit()
+end
+
+bit.tohex = function(x,n)
+    print("ERROR: Tell a dev to implement: bit.tohex")
+    os.exit()
+end
+
+bit.lshift = function(x,n)
+    print("ERROR: Tell a dev to implement: bit.lshift")
+    os.exit()
+end
+
+
+bit.rshift = function(x,n)
+    print("ERROR: Tell a dev to implement: bit.rshift")
+    os.exit()
+end
+
+bit.arshift = function(x,n)
+    -- TODO: this seems to easy.
+    return bit.brshift(x,n)
+end
+
+bit.rol = function(x,n)
+    print("ERROR: Tell a dev to implement: bit.rol")
+    os.exit()
+end
+
+bit.ror = function(x,n)
+    print("ERROR: Tell a dev to implement: bit.ror")
+    os.exit()
+end
+
+bit.bswap = function(x)
+    print("ERROR: Tell a dev to implement: bit.bswap")
+    os.exit()
 end