golang.org/x/sys/unix.IPv6Mreq.Interface (field)
2 uses
net
sockoptip6_posix.go#L34: mreq.Interface = uint32(ifi.Index)
syscall
ztypes_linux_amd64.go#L227: Interface uint32
The pages are generated with Golds v0.7.6. (GOOS=linux GOARCH=amd64)