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+2017-01-15         Andrew J. Schorr     <aschorr@telemetry-investments.com>
+
+	* interpret.h (r_interpret): Fix bug in Op_assign_concat reported
+	on Cygwin mailing list. The string concatenation optimization was
+	not updating the node correctly by setting STRING and STRCUR flags
+	and setting stfmt.
+
 2017-01-06         Andrew J. Schorr     <aschorr@telemetry-investments.com>
 
 	Enhance API to support extended-precision arithmetic.