[RFC PATCH 2/2] Add Octave:unexpected-densifying warning.

[Jason Riedy]

And I write:
> --- a/src/DLD-FUNCTIONS/sparse.cc
> +++ b/src/DLD-FUNCTIONS/sparse.cc
> @@ -370,6 +370,7 @@ DEFUN_DLD (full, args, ,
>  @end deftypefn")
>  {
>    octave_value retval;
> +  octave_warning_suspend("Octave:unexpectedly-densifying");

AUGH.  That line should be

  const octave_warning_suspend densifies ("Octave:unexpectedly-densifying");

Without the actual object (densifies), it may or may not work,
depending on when the compiler calls the destructor.

Jason