Dunno if this issue is because of the update and recent go version, but reflection seems to fail.
panic: reflect.Value.Addr of unaddressable value
runtime.panic+0xac ~/go/src/pkg/runtime/proc.c:1060
runtime.panic(0x4dfe58, 0xf84017c780)
reflect.Value·Addr+0x7e ~/go/src/pkg/reflect/value.go:388
reflect.Value·Addr(0x537110, 0xf8401cf280, 0x0, 0xf8401cf280, 0x0, ...)
github%2ecom/mattn/go-xmpp.next+0x30b ~/go/src/pkg/github.com/mattn/go-xmpp/xmpp.go:425
github%2ecom/mattn/go-xmpp.next(0xf8401c68c0, 0xf84000de00, 0x591e6c, 0x7475613c0000002d)
github%2ecom/mattn/go-xmpp.*Client·init+0x9c4 ~/go/src/pkg/github.com/mattn/go-xmpp/xmpp.go:171
github%2ecom/mattn/go-xmpp.*Client·init(0xf84019e080, 0x7fff35a80b18, 0xf00000008, 0x7fff35a80b3a, 0x8, ...)
github%2ecom/mattn/go-xmpp.NewClient+0x91b ~/go/src/pkg/github.com/mattn/go-xmpp/xmpp.go:107
github%2ecom/mattn/go-xmpp.NewClient(0x575ec4, 0x6b6c617400000013, 0x7fff35a80b18, 0x17, 0x7fff35a80b3a, ...)
main.main+0xbc /home/jan/dev/go/go-xmpp/example.go:27