*** ./src/bin/psql/tab-complete.c.orig	2010-08-14 15:59:49.000000000 +0200
--- ./src/bin/psql/tab-complete.c	2010-10-04 10:51:31.401032421 +0200
***************
*** 2447,2453 ****
  			 pg_strcasecmp(prev3_wd, "\\copy") != 0)
  		COMPLETE_WITH_SCHEMA_QUERY(Query_for_list_of_tsv, NULL);
  
- 
  /* Backslash commands */
  /* TODO:  \dc \dd \dl */
  	else if (strcmp(prev_wd, "\\connect") == 0 || strcmp(prev_wd, "\\c") == 0)
--- 2447,2452 ----
***************
*** 2517,2522 ****
--- 2516,2550 ----
  
  		COMPLETE_WITH_LIST(my_list);
  	}
+ 	else if (strcmp(prev_wd, "\\set") == 0)
+ 	{
+ 		const char **varnames;
+ 		int nvars = 0;
+ 		int size = 100;
+ 		struct _variable *ptr;
+ 
+ 		varnames = (const char **) pg_malloc((size + 1) * sizeof(char *));
+ 
+ 		/* fill array of varnames */
+ 		for (ptr = pset.vars->next; ptr; ptr = ptr->next)
+ 		{
+ 			if (nvars == size)
+ 			{
+ 				size = size + 100;
+ 				varnames = (const char **) realloc(varnames, (size + 1) * sizeof(char *));
+ 				if (!varnames)
+ 				{
+ 				    psql_error("out of memory\n");
+ 				    exit(EXIT_FAILURE);
+ 				}
+ 			}
+ 			varnames[nvars++] = ptr->name;
+ 		}
+ 		varnames[nvars] = NULL;
+ 		COMPLETE_WITH_LIST(varnames);
+ 		
+ 		free(varnames);
+ 	}
  	else if (strcmp(prev_wd, "\\sf") == 0 || strcmp(prev_wd, "\\sf+") == 0)
  		COMPLETE_WITH_SCHEMA_QUERY(Query_for_list_of_functions, NULL);
  	else if (strcmp(prev_wd, "\\cd") == 0 ||