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## Re: backslash no longer works in indices

 From: Karl Berry Subject: Re: backslash no longer works in indices Date: Mon, 22 Aug 2011 00:18:34 GMT

```Regarding backslashes and @macro, here is a reduced example file
producing the same error.

\input texinfo
@setfilename backmac

@macro funindex {TEXT}
@findex \TEXT\
@end macro

@funindex \q
@printindex fn
@bye

It took me a while to remember, but this is actually documented not to
work.  In the Invoking Macros node of the manual:

In addition to the comma, characters that need to be quoted in macro
arguments are curly braces and backslash.

There is also a caveat:

Unfortunately, this has not been reliably implemented in TeX.  When
macros are used in the argument to other commands, for example, errors
or incorrect output (the `\' "escape" being included literally) are
likely to result.

Nevertheless, if I change the @funindex arg from \q to \\q, I get the
expected output, an index entry for "\q".  So as long as the macro
invocations and definitions don't get even more complicated, I guess we
aren't running afoul of the caveat.  (This by way of warning. :)

Although we all wish that user-defined macros could have the same
behavior as normal commands, they don't and never will, in their current
form.

Best,
k

```