Useful MI functions marked @ignore in gdb/doc/gdb.texinfo.

[Eli Zaretskii]

> Date: Wed, 11 Apr 2012 14:48:22 -0700
> From: Joel Brobecker <brobecker@adacore.com>
> Cc: gdb@sourceware.org
> 
> > What's the story with these hidden, but documented MI functions?
> 
> This was a long time ago. My guess is that these commands were part
> of the initial design, and the design got captured as a hidden part
> of the documentation, but the commands themselves never got implemented.

That's right.  In fact, the MI part of the manual is the design
document converted to Texinfo when MI was added to the official
version of GDB.