bug#2355: 23.0.60; Enabling minor-mode disables major mode

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

In a file like this:

---------------- file: sample.tex ----------------
%% -*- mode:outline-minor; -*-

% Empty
--------------------------------------------------

Opening it and emacs will put it in fundamental mode with
outline-minor-mode and it is undesirable.

However,

---------------- file: sample.tex ----------------
% Empty

%% Local Variables:
%% mode: outline-minor
%% End:
--------------------------------------------------

Emacs will put it in LaTeX/TeX mode with outline-minor-mode.

I wonder if this is a bug.

Best,
Leo

GNU Emacs 23.0.60.1 (i386-mingw-nt5.1.2600) of 2008-12-14 on BREPNB