diff -r f789d2490669 -r 0fe0dce56bd8 doc-src/Tutorial/extra.sty
--- a/doc-src/Tutorial/extra.sty	Mon Aug 21 19:29:27 2000 +0200
+++ b/doc-src/Tutorial/extra.sty	Tue Aug 22 10:59:15 2000 +0200
@@ -1,6 +1,10 @@
 % extra.sty : Isabelle Manual extra macros for non-Springer version
 %
-\typeout{Document Style extra. Released 17 February 1994}
+\typeout{Document Style extra. Released 17/2/94, version of 22/8/00}
+
+\usepackage{ttbox}
+{\obeylines\gdef\ttbreak
+{\allowbreak}}
 
 %%Euro-style date: 20 September 1955
 \def\today{\number\day\space\ifcase\month\or
@@ -8,10 +12,6 @@
 July\or August\or September\or October\or November\or December\fi
 \space\number\year}
 
-%%Borrowed from alltt.sty, but leaves % as the comment character
-\def\docspecials{\do\ \do\$\do\&%
-  \do\#\do\^\do\^^K\do\_\do\^^A\do\~}
-
 %%%Put first chapter on odd page, with arabic numbering; like \cleardoublepage
 \newcommand\clearfirst{\clearpage\ifodd\c@page\else
     \hbox{}\newpage\if@twocolumn\hbox{}\newpage\fi\fi