Try to fix \index-ed `||` getting LaTeX confused

Turns out that special care needs to be taken when escaping `|`s in
`\index{}`. See also
http://tex.stackexchange.com/questions/176931/how-to-escape-character-in-index

report/basic.verb

@@ -40,7 +40,7 @@ more readable.
 \label{prelude-bool}
 \indextycon{Bool}
 \indextt{False}\indextt{True}
-\index{""|""|@@{\tt  {\char'174}{\char'174}}}
+\index{\vert\vert@@{\tt  {\char'174}{\char'174}}}
 \index{&&@@{\tt  \&\&}}
 \indextt{not}
 \indextt{otherwise}

report/decls.verb

@@ -1464,7 +1464,7 @@ edence & operators		& operators     	& operators \\ \hline\hline
 \indextt{elem}
 \indextt{notElem}
 \index{&&@@{\tt  \&\&}}
-\index{""|""|@@{\tt  {\char'174}{\char'174}}}
+\index{\vert\vert@@{\tt  {\char'174}{\char'174}}}
 \indextt{>>}
 \indextt{>>=}
 \index{$@@{\tt  {\char'044}}}

report/haskell.verb

 % Formatting for double-sided
 \documentclass[twoside,10pt]{book}
 
+\usepackage[T1]{fontenc}
 \usepackage{times}
 \usepackage{makeidx}
 \usepackage{graphicx}

tools/splitAndIndexPgm

@@ -114,10 +114,10 @@ sub printIndexEntries { # also re-sets $indexentries, specialentries
 	    #
 	    # there are a few "raw" chars that need fiddling, too...
 	    #
-	    $raw =~ s/\|/""\|/g;
 	    $raw =~ s/!/""!/g;
 	    $raw =~ s/\@/""\@\@/g;
 	    $raw =~ s/\\/\\\\/g;
+	    $raw =~ s/\|/\\vert/g;
 
     	    print "\\index\{$raw\@\@$processed\}%\n";
 	} else {