aliases/macros in @chapter/@section/etc vs. table of contents

[Jim Meyering]

I noticed that using user-defined macros or aliases in
@chapter or @section names doesn't work.

Here's a sample input file, k.texi
-------------------------------
\input texinfo

@macro fn{name}
@code{\name\()}
@end macro

@contents

@chapter @fn{foo}

@bye

=============================
$ texi2dvi --pdf --batch k.texi
...
./k.toc:1: Use of \ doesn't match its definition
...

Note how the .toc file looks bogus:
=============================
$ cat k.toc
@numchapentry{\fn {foo}}{1}{}{1}


If I expand the macro manually it works fine:

  @chapter @code{foo()}