Problem between Emacs trunk and AUCTeX

[Angelo Graziosi]

It seems that rev. 108838 don't like AUCTeX. To reproduce:

1. Shorcircuit .emacs.d and other initialization files
2. build and install Emacs trunk >= r.108838

3. start Emacs. For example

      /us/local/emacs/bin/emacs &

4. Install AUCTeX with Options | Manage Emacs Packages

5. C-x C-f foo.tex

A buffer *Compile-Log* will open with the text

"Error: Don't know how to compile nil"

In a normal work, this is very annoying..

Thanks,
Angelo.