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we prefer nil over 0, make the example show it.

--- a/sys/man/2/dial

+++ b/sys/man/2/dial

@@ -256,7 +256,7 @@

 .EX

 int callkremvax(void)

 {

-	return dial("kremvax", 0, 0, 0);

+	return dial("kremvax", nil, nil, nil);

 }

 .EE

 .PP

@@ -265,7 +265,7 @@

 .EX

 int dialauth(char *service)

 {

-	return dial(netmkaddr("$auth", 0, service), 0, 0, 0);

+	return dial(netmkaddr("$auth", nil, service), nil, nil, nil);

 }

 .EE

 .PP

@@ -307,7 +307,7 @@

 			/* echo until EOF */

 			while((n = read(dfd, buf, sizeof(buf))) > 0)

 				write(dfd, buf, n);

-			exits(0);

+			exits(nil);

 		default:

 			close(lcfd);

 			break;

-- 

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