back to plain Position.report for regular references;
ContextPosition.report_visible for decls;
report_token/parse_token: back to context-less version;
\index{model checking example|(}%
\index{lfp@{\texttt{lfp}}!applications of|see{CTL}}
\input{CTL/document/Base.tex}
\input{CTL/document/PDL.tex}
\input{CTL/document/CTL.tex}
\index{model checking example|)}