Avoid a memory leak and/or assertion failure when parsing a table

declaration that contains a duplicate column name.
Ticket #1418. (CVS 2684)

FossilOrigin-Name: f43427742b1c086f2621c900f4ede1a34a8b44ee

test/table.test

@@ -11,7 +11,7 @@
 # This file implements regression tests for SQLite library.  The
 # focus of this file is testing the CREATE TABLE statement.
 #
-# $Id: table.test,v 1.40 2005/08/13 00:56:28 drh Exp $
+# $Id: table.test,v 1.41 2005/09/10 15:35:07 drh Exp $
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
@@ -388,6 +388,11 @@ do_test table-9.1 {
     CREATE TABLE t6(a,b,a);
   }
 } {1 {duplicate column name: a}}
+do_test table-9.2 {
+  catchsql {
+    CREATE TABLE t6(a varchar(100), b blob, a integer);
+  }
+} {1 {duplicate column name: a}}
 
 # Check the foreign key syntax.
 #