added a specific SMT exception captured by smt_tac (prevents the SMT method from failing with an exception),
replaced unspecific 'error' invocations with raising of specific SMT exceptions,
added annotations to traced SMT problem and solver output
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\documentclass[10pt,a4paper]{article}
\usepackage{isabelle,isabellesym,pdfsetup}
%packages for unusual symbols according to 'isabelle latex -o syms'
\usepackage[latin1]{inputenc}
\usepackage{amssymb}
\usepackage{textcomp}
\pagestyle{myheadings}
\renewcommand{\isamarkupheader}[1]%
{{\def\isacharunderscore{\mbox{-}}%
\section*{#1}\markright{FILE~``\isabellecontext''}}}
\begin{document}
\input{session}
\end{document}
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