new type 'lua_Ctx' for continuation-function contexts (to allow type

to be configurable)

ldo.c

@@ -1,5 +1,5 @@
 /*
-** $Id: ldo.c,v 2.124 2014/06/30 19:48:08 roberto Exp roberto $
+** $Id: ldo.c,v 2.125 2014/07/15 21:26:50 roberto Exp roberto $
 ** Stack and Call structure of Lua
 ** See Copyright Notice in lua.h
 */
@@ -593,7 +593,8 @@ LUA_API int lua_isyieldable (lua_State *L) {
 }
 
 
-LUA_API int lua_yieldk (lua_State *L, int nresults, int ctx, lua_KFunction k) {
+LUA_API int lua_yieldk (lua_State *L, int nresults, lua_Ctx ctx,
+                        lua_KFunction k) {
   CallInfo *ci = L->ci;
   luai_userstateyield(L, nresults);
   lua_lock(L);