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Do not use a reserved namespace

is* is a reserved namespace and it should not be used.

--- a/cc1/expr.c

+++ b/cc1/expr.c

@@ -128,7 +128,7 @@

 }

 static int

-isnull(Node *np)

+null(Node *np)

 {

 	if (!np->constant || np->type != pvoidtype)

 		return 0;

@@ -170,9 +170,9 @@

 			 * If we have a null pointer constant then

 			 * convert to the another type

 			 */

-			if (isnull(yes))

+			if (null(yes))

 				yes = convert(yes, no->type, 0);

-			if (isnull(no))

+			if (null(no))

 				no = convert(no, yes->type, 0);

 			if (!eqtype(yes->type, no->type))