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+2011-08-21  Joel E. Denny  <joeldenny@joeldenny.org>
+
+	tests: fix empty unions.
+	Empty unions are not accepted by the ISO C99 grammar or by at
+	least some versions of Sun Studio.  Reported by Wolfgang S. Kechel
+	at
+	<http://lists.gnu.org/archive/html/bug-bison/2011-08/msg00003.html>.
+	* NEWS (2.5.1): Document fix.
+	* THANKS (Wolfgang S. Kechel): Add.
+	* tests/existing.at (GNU Cim Grammar)
+	(GNU pic (Groff 1.18.1) Grammar.): Remove empty %union.
+
 2011-07-24  Joel E. Denny  <joeldenny@joeldenny.org>
 
 	global: remove unnecessary horizontal tabs.