const golang.org/x/sys/unix.TUNSETDEBUG

one use

	golang.org/x/sys/unix (current package)
		zerrors_linux_amd64.go#L460: 	TUNSETDEBUG                      = 0x400454c9

The pages are generated with Golds v0.4.9. (GOOS=linux GOARCH=amd64)