Properly set "escape_string_warning" to default to true.

doc/src/sgml/config.sgml

 <!--
-$PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.50 2006/03/06 19:49:19 momjian Exp $
+$PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.51 2006/03/07 02:54:23 momjian Exp $
 -->
 <chapter Id="runtime-config">
   <title>Server Configuration</title>
@@ -3733,7 +3733,7 @@ dynamic_library_path = 'C:\tools\postgresql;H:\my_project\lib;$libdir'
        <para>
         When on, a warning is issued if a backslash (<literal>\</>)
         appears in an ordinary string literal (<literal>'...'</>
-        syntax). The default is <literal>off</>.
+        syntax). The default is <literal>on</>.
        </para>
        <para>
         Escape string syntax (<literal>E'...'</>) should be used for

src/backend/utils/misc/guc.c

@@ -10,7 +10,7 @@
  * Written by Peter Eisentraut <peter_e@gmx.net>.
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.313 2006/03/06 19:49:20 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.314 2006/03/07 02:54:23 momjian Exp $
  *
  *--------------------------------------------------------------------
  */
@@ -969,7 +969,7 @@ static struct config_bool ConfigureNamesBool[] =
 			NULL
 		},
 		&escape_string_warning,
-		false, NULL, NULL
+		true, NULL, NULL
 	},
 
 	{