[lltx] luaotfload v2.2 cannot load system font

[Bill Sun]

Hi,

I updated my texlive 2013 pretest on May 14, and luaotfload was updated
to v2.2 (2013/05/10). After the update, no matter I use fontspec or
luaotfload package in the preamble, lualatex cannot load system font.
Both produce the same error message.

System info:
texlive 2013 pretest, last update on May 16. Archlinux x86_64.

Here's the error message:
    ! LuaTeX error 
.../texlive/texmf-dist/tex/luatex/luaotfload/luaotfload.lua:85: a
    ttempt to index global 'dir' (a nil value)
    stack traceback:
            .../texlive/texmf-dist/tex/luatex/luaotfload/luaotfload.lua:85: in 
main chunk
            [C]: in function 'require'
            ...pt/texlive/texmf-dist/tex/luatex/luatexbase/modutils.lua:57: in 
function 're
    quire_module'
            [string "\directlua "]:1: in main chunk.
    \lltxb@requirelua ...xluaescapestring {#2}" \fi )}

    l.41 \fi

Regards.