Patch: add gdb.parse_and_eval

[Eli Zaretskii]

> From: Tom Tromey <tromey@redhat.com>
> Reply-To: tromey@redhat.com
> Date: Thu, 11 Jun 2009 14:49:16 -0600
> 
> +@findex gdb.parse_and_eval
> +@defun parse_and_eval expression
> +Parse @var{expression} as an expression in the current language,
> +evaluate it, and return the result as a @code{gdb.Value}.
> +@var{expression} must be a string.
> +@end defun

Thanks.  This is okay, but given the recent discussions which
indicated that this feature is necessary for a broad class of scripts,
I would expect a bit more text in the manual about it, describing when
and how this would be useful.

The user manual is not just a reference list of existing commands and
options.  It contains, in addition, the glue: explanations of how
these features fit together to support important use-cases one meets
while debugging programs.  Without this glue, the manual would be a
much less useful document.

TIA