This:
debug.getmetatable("").__index = function (s, i) return s:sub(i, i) end
and this:
debug.getmetatable("").__index = _proc_lua_read
does not work.
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1 Answer
Try
debug.getmetatable("").__index = function (s, i) return string.sub(s,i,i) end
Note that by redefining __index for strings in that way, you lose the ability to call methods on strings: note how the code does not call s:sub. For a better solution that avoids that, see http://lua-users.org/lists/lua-l/2007-11/msg00619.html . Or set __call instead:
getmetatable("").__call = string.sub
