Patch 7.4.462
Problem:    Setting the local value of 'backupcopy' empty gives an error.
            (Peter Mattern)
Solution:   When using an empty value set the flags to zero. (Hirohito
            Higashi)
Files:      src/option.c


*** ../vim-7.4.461/src/option.c 2014-09-23 15:45:04.870801055 +0200
--- src/option.c        2014-09-29 17:03:06.963943648 +0200
***************
*** 5742,5756 ****
            flags = &curbuf->b_bkc_flags;
        }
  
!       if (opt_strings_flags(bkc, p_bkc_values, flags, TRUE) != OK)
!           errmsg = e_invarg;
!       if ((((int)*flags & BKC_AUTO) != 0)
!               + (((int)*flags & BKC_YES) != 0)
!               + (((int)*flags & BKC_NO) != 0) != 1)
        {
!           /* Must have exactly one of "auto", "yes"  and "no". */
!           (void)opt_strings_flags(oldval, p_bkc_values, flags, TRUE);
!           errmsg = e_invarg;
        }
      }
  
--- 5742,5762 ----
            flags = &curbuf->b_bkc_flags;
        }
  
!       if ((opt_flags & OPT_LOCAL) && *bkc == NUL)
!           /* make the local value empty: use the global value */
!           *flags = 0;
!       else
        {
!           if (opt_strings_flags(bkc, p_bkc_values, flags, TRUE) != OK)
!               errmsg = e_invarg;
!           if ((((int)*flags & BKC_AUTO) != 0)
!                   + (((int)*flags & BKC_YES) != 0)
!                   + (((int)*flags & BKC_NO) != 0) != 1)
!           {
!               /* Must have exactly one of "auto", "yes"  and "no". */
!               (void)opt_strings_flags(oldval, p_bkc_values, flags, TRUE);
!               errmsg = e_invarg;
!           }
        }
      }
  
*** ../vim-7.4.461/src/version.c        2014-09-27 11:18:08.179520979 +0200
--- src/version.c       2014-09-29 17:13:50.235945053 +0200
***************
*** 743,744 ****
--- 743,746 ----
  {   /* Add new patch number below this line */
+ /**/
+     462,
  /**/

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