const syscall.IPV6_MULTICAST_LOOP

2 uses

	syscall (current package)
		zerrors_darwin_amd64.go#L532: 	IPV6_MULTICAST_LOOP               = 0xb

	net
		sockoptip_posix.go#L35: 	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_LOOP, boolint(v))

The pages are generated with Golds v0.3.2-preview. (GOOS=darwin GOARCH=amd64)
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