Re: next-error refactoring

[Richard Stallman]

    This can be applied to functions when their locations are listed in
    another buffer by commands that operate on function names, for example,
    `list-tags' (which is not "next-error" capable now),

That is a good idea.  However, I don't see a need to change frameworks
based on that.

                                                         `list-imenu',
    `list-outlines' (there are no such functions yet, but they would be useful).

I am not sure that a list-imenu command would make sense.  But
we can add connections to next-error in other places where that
does make sense.