This is pdfTeXk, Version 3.141592-1.40.3 (Web2C 7.5.6) (format=etex 2009.12.11)  11 FEB 2010 10:52
entering extended mode
 file:line:error style messages enabled.
 %&-line parsing enabled.
**./quotebug.texi
(./quotebug.texi (./texinfo.tex Loading texinfo [version 2009-08-14.15]:
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 and turning on texinfo input format.)
./quotebug.texi:5: Interruption.
l.5   F_L'
          (\eta,x) = fcp[k_L] * \exp(exp_F)
? x
No pages of output.