Problem:    Conceal: using Tab for cchar causes problems. (ZyX)
Solution:   Do not accept a control character for cchar.
Files:      src/syntax.c


*** ../vim-7.3.103/src/syntax.c 2010-09-29 18:32:47.000000000 +0200
--- src/syntax.c        2011-01-22 00:50:20.000000000 +0100
***************
*** 4537,4542 ****
--- 4537,4549 ----
                ;
  #endif
            }
+ #ifdef FEAT_CONCEAL
+           if (!vim_isprintc_strict(*conceal_char))
+           {
+               EMSG(_("E844: invalid cchar value"));
+               return NULL;
+           }
+ #endif
            arg = skipwhite(arg + 7);
        }
        else
*** ../vim-7.3.103/src/version.c        2011-01-22 00:11:42.000000000 +0100
--- src/version.c       2011-01-22 00:54:56.000000000 +0100
***************
*** 716,717 ****
--- 716,719 ----
  {   /* Add new patch number below this line */
+ /**/
+     104,
  /**/

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