search.c (lookup_field): Return a NULL_TREE if XBASETYPE is itself null.

        * search.c (lookup_field): Return a NULL_TREE if XBASETYPE is
        itself null.

From-SVN: r8143

gcc/cp/ChangeLog

+Tue Sep 27 10:18:57 1994  Brendan Kehoe  (brendan@lisa.cygnus.com)
+
+	* search.c (lookup_field): Return a NULL_TREE if XBASETYPE is
+	itself null.
+
 Wed Sep 14 10:17:27 1994  Michael I Bushnell  <mib@churchy.gnu.ai.mit.edu>
 
 	* g++.c: Include <sys/errno.h> in case `errno' is a macro

gcc/cp/search.c

@@ -1031,6 +1031,10 @@ lookup_field (xbasetype, name, protect, want_type)
      accurate error messages for access control.  */
   int index = MEMOIZED_HASH_FN (name);
 
+  /* We sometimes go looking with XBASETYPE pre-set to null.  */
+  if (xbasetype == NULL_TREE)
+    return NULL_TREE;
+
   /* If we are looking for a constructor in a templated type, use the
      unspecialized name, as that is how we store it.  */
   if (IDENTIFIER_TEMPLATE (name))