bug#26274: 26.0.50; completion regression

[Stephen Berman]

On Wed, 29 Mar 2017 14:49:42 -0400 Noam Postavsky 
<npostavs@users.sourceforge.net> wrote:

> On Wed, Mar 29, 2017 at 2:27 PM, Stephen Berman <stephen.berman@gmx.net> 
> wrote:
>
>> Thanks, removing that file allowed configure to complete, but now I get
>> this:
>>
>> checking that generated files are newer than configure... done
>> configure: creating ./config.status
>> make: *** No rule to make target 'lib/gnulib.mk.in', needed by 'Makefile'.  
>> Stop.
>
> Starting from a fresh checkout like Eli suggested is the safest way,
> but I guess you should be able to get around this error by deleting
> 'Makefile', and regenerating it by running ./configure again.

Thanks, I went this route, and it worked (and still took almost an hour
to go through eight iterations).  Git bisect in fact pinpointed this
commit:

5ec3a58462e99533ea5200de356302181d634d0b is the first bad commit
commit 5ec3a58462e99533ea5200de356302181d634d0b
Author: Michal Nazarewicz <mina86@mina86.com>
Date:   Mon Sep 19 00:23:40 2016 +0200

    Generate upcase and downcase tables from Unicode data  (bug#24603)
    
    Use Unicode data to generate case tables instead of mostly repeating
    them in lisp code.  Do that in a way which maps ‘Dz’ (and similar)
    digraph to ‘dz’ when down- and ‘DZ’ when upcasing.
    
    https://debbugs.gnu.org/cgi/bugreport.cgi?msg=89;bug=24603 lists all
    changes to syntax table and case tables introduced by this commit.
    
    * lisp/international/characters.el: Remove case-pairs defined with
    explicit Lisp code and instead use Unicode character properties.
    
    * test/src/casefiddle-tests.el (casefiddle-tests--characters,
    casefiddle-tests-casing): Update test cases which are now working
    as they should.

(When Eli listed this as a candidate, I doubted it because of the date,
since my build from February 8 of this year does not have the problem.
I guess that date is not the commit date.  Confusing when looking at the
commit log.)

Steve Berman