>> On Wed, Mar 23 2016 12:41, Vitalie Spinu wrote:

>> I'm just suggesting to keep the limits as markers rather than as integers.

Attaching a patch for this. AFAIC it shapes pretty nicely. There are two types
of narrowing, visual and hard. The imposition or lifting of these is done
through narrow-to-region and widen depending on the value of optional HARD
argument.

I haven't tested it yet because of the following build problem with loaddeffs:

    ...    
    Finding pointers to doc strings...
    Finding pointers to doc strings...done
    Dumping under the name emacs
    91970 pure bytes used
    : paxctl -zex emacs
    mv -f emacs bootstrap-emacs
    make -C ../lisp compile-first EMACS="../src/bootstrap-emacs"
    make[3]: Entering directory '/home/vspinu/bin/emacs-test/lisp'
      ELC      emacs-lisp/macroexp.elc
      ELC      emacs-lisp/cconv.elc
      ELC      emacs-lisp/byte-opt.elc
      ELC      emacs-lisp/bytecomp.elc
      ELC      emacs-lisp/autoload.elc
    make[3]: Leaving directory '/home/vspinu/bin/emacs-test/lisp'
    make -C ../lisp autoloads EMACS="../src/bootstrap-emacs"
    make[3]: Entering directory '/home/vspinu/bin/emacs-test/lisp'
      GEN      calendar/cal-loaddefs.el
    Loading macroexp.elc...
    appt.el:0:0: error: wrong-type-argument: (markerp /home/vspinu/bin/emacs-test/lisp/calendar/appt.el)
    Makefile:402: recipe for target 'calendar/cal-loaddefs.el' failed
    make[3]: *** [calendar/cal-loaddefs.el] Error 255
    make[3]: Leaving directory '/home/vspinu/bin/emacs-test/lisp'
    Makefile:727: recipe for target '../lisp/loaddefs.el' failed
    make[2]: *** [../lisp/loaddefs.el] Error 2
    make[2]: Leaving directory '/home/vspinu/bin/emacs-test/src'
    Makefile:398: recipe for target 'src' failed
    make[1]: *** [src] Error 2
    make[1]: Leaving directory '/home/vspinu/bin/emacs-test'
    Makefile:1091: recipe for target 'bootstrap' failed
    make: *** [bootstrap] Error 2


Any ideas of why this is happening?

The relevant branch is scratch/hard-narrow.


  Vitalie