To: vim-dev@vim.org
Subject: Patch 7.0.077
Fcc: outbox
From: Bram Moolenaar <Bram@moolenaar.net>
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------------

Patch 7.0.077
Problem:    ":unlet v:this_session" causes a crash. (Marius Roets)
Solution:   When trying to unlet a fixed variable give an error message.
Files:	    src/eval.c


*** ../vim-7.0.076/src/eval.c	Tue Aug 29 21:59:25 2006
--- src/eval.c	Sat Sep  2 13:43:20 2006
***************
*** 701,706 ****
--- 701,707 ----
  static void list_one_var_a __ARGS((char_u *prefix, char_u *name, int type, char_u *string));
  static void set_var __ARGS((char_u *name, typval_T *varp, int copy));
  static int var_check_ro __ARGS((int flags, char_u *name));
+ static int var_check_fixed __ARGS((int flags, char_u *name));
  static int tv_check_lock __ARGS((int lock, char_u *name));
  static void copy_tv __ARGS((typval_T *from, typval_T *to));
  static int item_copy __ARGS((typval_T *from, typval_T *to, int deep, int copyID));
***************
*** 3364,3369 ****
--- 3365,3372 ----
  	hi = hash_find(ht, varname);
  	if (!HASHITEM_EMPTY(hi))
  	{
+ 	    if (var_check_fixed(HI2DI(hi)->di_flags, name))
+ 		return FAIL;
  	    if (var_check_ro(HI2DI(hi)->di_flags, name))
  		return FAIL;
  	    delete_var(ht, hi);
***************
*** 17818,17824 ****
  }
  
  /*
!  * Return TRUE if di_flags "flags" indicate read-only variable "name".
   * Also give an error message.
   */
      static int
--- 17821,17827 ----
  }
  
  /*
!  * Return TRUE if di_flags "flags" indicates variable "name" is read-only.
   * Also give an error message.
   */
      static int
***************
*** 17834,17839 ****
--- 17837,17859 ----
      if ((flags & DI_FLAGS_RO_SBX) && sandbox)
      {
  	EMSG2(_(e_readonlysbx), name);
+ 	return TRUE;
+     }
+     return FALSE;
+ }
+ 
+ /*
+  * Return TRUE if di_flags "flags" indicates variable "name" is fixed.
+  * Also give an error message.
+  */
+     static int
+ var_check_fixed(flags, name)
+     int		flags;
+     char_u	*name;
+ {
+     if (flags & DI_FLAGS_FIX)
+     {
+ 	EMSG2(_("E795: Cannot delete variable %s"), name);
  	return TRUE;
      }
      return FALSE;
*** ../vim-7.0.076/src/version.c	Tue Aug 29 22:35:11 2006
--- src/version.c	Sat Sep  2 13:39:36 2006
***************
*** 668,669 ****
--- 668,671 ----
  {   /* Add new patch number below this line */
+ /**/
+     77,
  /**/

-- 
            ### Hiroshima 45, Chernobyl 86, Windows 95 ###

 /// Bram Moolenaar -- Bram@Moolenaar.net -- http://www.Moolenaar.net   \\\
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