commit 463154c669010cffc0e96b683576f1e879b61d8b
Author: yac <yac@blesmrt.net>
Date:   Mon Mar 11 18:42:39 2013 +0100

    don't unlink the result file

Index: postgresql-12beta2/src/test/regress/pg_regress.c
===================================================================
--- postgresql-12beta2.orig/src/test/regress/pg_regress.c
+++ postgresql-12beta2/src/test/regress/pg_regress.c
@@ -2597,7 +2597,6 @@ regression_main(int argc, char *argv[],
 	else
 	{
 		unlink(difffilename);
-		unlink(logfilename);
 	}
 
 	if (fail_count != 0)