On 25/08/2011, at 10:13 PM, Stephan Hennig wrote:

> fails with an up-to-date TL2011:
> 
> \listfiles
> \documentclass{article}
> \usepackage{fontspec}
> \begin{document}
> A
> \end{document}

Hi Stephan,

Sorry for the inconvenience. I just updated my tl2011 installation and I don't have any problems myself (I've attached the \listfiles output below). Is there any chance you have an older version of the expl3 packages installed locally?

Now that I think of it, note that the LaTeX3 code has been re-arranged recently and an older copy may still be present in your distribution's texmf tree (what used to be inside expl3/ is now in l3kernel/); I'm not entirely sure under what situations this could happen but I think some others have also had this issue.

Hope this helps,
Will



 *File List*
 article.cls    2007/10/19 v1.4h Standard LaTeX document class
  size10.clo    2007/10/19 v1.4h Standard LaTeX file (size option)
fontspec.sty    2011/02/26 v2.1f Advanced font selection for XeLaTeX/LuaLaTeX
   expl3.sty    2011/08/17 v2607 L3 Experimental code bundle wrapper
 l3names.sty    2011/08/10 v2538 L3 Experimental namespace for primitives
l3bootstrap.sty    2011/08/13 v2558 L3 Experimental bootstrap code
  luatex.sty    2010/03/09 v0.4 LuaTeX basic definition package (HO)
infwarerr.sty    2010/04/08 v1.3 Providing info/warning/message (HO)
ifluatex.sty    2010/03/01 v1.3 Provides the ifluatex switch (HO)
    etex.sty    1998/03/26 v2.0 eTeX basic definition package (PEB)
luatex-loader.sty    2010/03/09 v0.4 Lua module loader (HO)
pdftexcmds.sty    2011/04/22 v0.16 Utilities of pdfTeX for LuaTeX (HO)
 ltxcmds.sty    2011/04/18 v1.20 LaTeX kernel commands for general use (HO)
   ifpdf.sty    2011/01/30 v2.3 Provides the ifpdf switch (HO)
    calc.sty    2007/08/22 v4.3 Infix arithmetic (KKT,FJ)
l3basics.sty    2011/07/04 v2493 L3 Experimental basic definitions
 l3expan.sty    2011/08/11 v2545 L3 Experimental argument expansion
    l3tl.sty    2011/08/13 v2566 L3 Experimental token lists
   l3seq.sty    2011/08/15 v2586 L3 Experimental sequences and stacks
   l3int.sty    2011/08/16 v2600 L3 Experimental integers
 l3quark.sty    2011/08/11 v2549 L3 Experimental quarks
   l3prg.sty    2011/08/16 v2601 L3 Experimental control structures
 l3clist.sty    2011/07/09 v2498 L3 Experimental comma separated lists
 l3token.sty    2011/08/14 v2579 L3 Experimental token manipulation
  l3prop.sty    2011/06/19 v2478 L3 Experimental property lists
   l3msg.sty    2011/08/16 v2601 L3 Experimental messages
    l3io.sty    2011/08/16 v2595 L3 Experimental input-output operations
  l3file.sty    2011/06/19 v2478 L3 Experimental file operations
  l3skip.sty    2011/08/09 v2526 L3 Experimental dimensions and skips
   l3box.sty    2011/08/16 v2595 L3 Experimental boxes
l3keyval.sty    2011/08/16 v2601 L3 Experimental key-value parsing
  l3keys.sty    2011/08/14 v2568 L3 Experimental key-value interfaces
    l3fp.sty    2011/06/19 v2478 L3 Experimental floating-point operations
l3luatex.sty    2011/08/11 v2545 L3 Experimental LuaTeX-specific functions
  l3toks.sty    2011/08/16 v2601 L3 Experimental token registers
  xparse.sty    2011/08/17 v2607 L3 Experimental document command parser
luaotfload.sty    2011/04/21 v1.25 OpenType layout system
luatexbase.sty    2010/10/06 v0.3 Module utilities for LuaTeX
luatexbase-compat.sty    2010/10/10 v0.3 Compatibility tools for LuaTeX
luatexbase-loader.sty    2010/10/10 v0.3 Lua module loader for LuaTeX
luatexbase-regs.sty    2010/10/10 v0.3 Registers allocation for LuaTeX
luatexbase-attr.sty    2011/05/21 v0.31 Attributes allocation for LuaTeX
luatexbase-cctb.sty    2010/10/10 v0.3 Catcodetable allocation for LuaTeX
luatexbase-mcb.sty    2010/10/10 v0.3 Callback management for LuaTeX
luatexbase-modutils.sty    2010/10/10 v0.3 Module utilities for LuaTeX
 xkeyval.sty    2008/08/13 v2.6a package option processing (HA)
 xkeyval.tex    2008/08/13 v2.6a key=value parser (HA)
fontspec-patches.sty    2011/02/26 v2.1f Advanced font selection for XeLaTeX/Lu
aLaTeX
fixltx2e.sty    2006/09/13 v1.1m fixes to LaTeX
 fontenc.sty
  eu2enc.def    2010/05/27 v0.1h Experimental Unicode font encodings
  eu2lmr.fd    2009/10/30 v1.6 Font defs for Latin Modern
xunicode.sty    2010/11/06 v0.96 provides access to latin accents and many othe
r characters in Unicode lower plane
fontspec.cfg