const golang.org/x/sys/unix.IPV6_JOIN_ANYCAST

one use

	golang.org/x/sys/unix (current package)
		zerrors_linux.go#L1598: 	IPV6_JOIN_ANYCAST                           = 0x1b

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