2005-02-10  Paolo Bonzini  <bonzini@gnu.org>

	* posix/regcomp.c (lower_subexp): Do not optimize empty
	subexpressions even with REG_NOSUB.
	* posix/rxspencer/tests: Add a previously failing testcase.

--- orig/regcomp.c
+++ mod/regcomp.c
@@ -1321,6 +1321,11 @@ lower_subexp (err, preg, node)
   bin_tree_t *op, *cls, *tree1, *tree;
 
   if (preg->no_sub
+      /* We do not optimize empty subexpressions, because otherwise we may
+	 have bad CONCAT nodes with NULL children.  This is obviously not
+	 very common, so we do not lose much.  An example that triggers
+	 this case is the sed "script" /\(\)/x.  */
+      && node->left
       && (node->token.opr.idx >= 8 * sizeof (dfa->used_bkref_map)
 	  || !(dfa->used_bkref_map & (1 << node->token.opr.idx))))
     return node->left;
--- orig/rxspencer/tests
+++ mod/rxspencer/tests
@@ -376,6 +376,7 @@
 a[bc]d		-	xyzaaabcaababdacd	abd
 a[ab]c		-	aaabc	abc
 abc		s	abc	abc
+()		s	abc	@abc
 a*		&	b	@b
 
 # Let's have some fun -- try to match a C comment.