const golang.org/x/sys/unix.IPV6_FLOWINFO_MASK

one use

	golang.org/x/sys/unix (current package)
		zerrors_linux_amd64.go#L120: 	IPV6_FLOWINFO_MASK               = 0xffffff0f

The pages are generated with Golds v0.7.6. (GOOS=linux GOARCH=amd64)