polyfill exit fix

src/polyfill.lua

@@ -13,7 +13,7 @@ _G.require = function (module)
                     end
                 else
                     print("ERROR: Tell a dev to implement: " .. i)
-                    os.exit()
+                    error("ERROR: Tell a dev to implement: " .. i)
                 end
              end
         }
@@ -21,7 +21,7 @@ _G.require = function (module)
         return module
     end
     print("ERROR: Tell a dev to implement: " .. module)
-    os.exit()
+    error("ERROR: Tell a dev to implement: " .. module)
 end
 
 -- Polyfill bit. see: http://bitop.luajit.org/api.html
@@ -36,23 +36,23 @@ end
 
 bit.tobit = function(x)
     print("ERROR: Tell a dev to implement: bit.tobi")
-    os.exit()
+    error()
 end
 
 bit.tohex = function(x,n)
     print("ERROR: Tell a dev to implement: bit.tohex")
-    os.exit()
+    error()
 end
 
 bit.lshift = function(x,n)
     print("ERROR: Tell a dev to implement: bit.lshift")
-    os.exit()
+    error()
 end
 
 
 bit.rshift = function(x,n)
     print("ERROR: Tell a dev to implement: bit.rshift")
-    os.exit()
+    error()
 end
 
 bit.arshift = function(x,n)
@@ -62,15 +62,15 @@ end
 
 bit.rol = function(x,n)
     print("ERROR: Tell a dev to implement: bit.rol")
-    os.exit()
+    error()
 end
 
 bit.ror = function(x,n)
     print("ERROR: Tell a dev to implement: bit.ror")
-    os.exit()
+    error()
 end
 
 bit.bswap = function(x)
     print("ERROR: Tell a dev to implement: bit.bswap")
-    os.exit()
+    error()
 end