lua_iscfunction  6291 host/minilua.c else if(lua_iscfunction(L,-2)||lua_setfenv(L,-2)==0)
lua_iscfunction   451 lib_package.c        lua_iscfunction(L, -1))
lua_iscfunction   137 lua.h          LUA_API int             (lua_iscfunction) (lua_State *L, int idx);