Recent commit using Lua 5.2 only functions breaking 5.1 compatibility

[nmcveity]

Installing the latest luaposix with luarocks yields:

$ lua
Lua 5.1.5  Copyright (C) 1994-2012 Lua.org, PUC-Rio
> require('posix')
error loading module 'posix_c' from file '/home/nick/.luarocks/lib/lua/5.1/posix_c.so':
        /home/nick/.luarocks/lib/lua/5.1/posix_c.so: undefined symbol: lua_tointegerx
stack traceback:
        [C]: ?
        [C]: in function 'require'
        /home/nick/.luarocks/share/lua/5.1/posix.lua:2: in main chunk
        [C]: in function 'require'
        stdin:1: in main chunk
        [C]: ?

It was correctly built against Lua 5.1, as far as I can tell. The cause seems to be a recent change (67e01c8) which added calls to lua_tointegerx and lua_len, both 5.2 only.

[rrthomas]

Thanks for that, and apologies for being the 5.2-centric person who committed the incompatible change.