pass lua_State to function 'lisp_to_lua'
call lisp variable-bound functions from lua
lua object for accessing lisp functions
call lisp objects from `luaD_precall' instead
enable lisp functions in metatable __index fields
use lua_gettable,lua_settable instead of lua_getfield, lua_setfield
lisp primitive to wrap lua_rawset
track the arg count for calling lisp function from lua
case for calling lisp functions from lisp via lua