Sub Articulo 71.0

 I'm trying to write a command to create index entries, where a name
 should appear in \tt in the index:
 
 \newcommand{\ixm}[1]{%
    \index{#1@\texttt{#1} macro}%
    \index{macros!#1@\texttt{#1}}}
 
 This works OK, unless I want to use it to define a page range:
 
 \ixm{GOODFIT|(}
   ...
 \ixm{GOODFIT)}