Mismatch in the Getting Started with Identity v3

[sbezverk]

from the example taken line of code,
client, err := openstack.NewIdentityV3(provider, gophercloud.EndpointOpts{
Region: "RegionOne",
})
when compiled, generates this error:
./main.go:86: assignment count mismatch: 2 = 1
./main.go:88: too many arguments in call to openstack.NewIdentityV3
have (*gophercloud.ProviderClient, gophercloud.EndpointOpts)
want (*gophercloud.ProviderClient)

Please advise where the issue is.

[sbezverk]

also openstack.NewIdentityV3 call does not return err as it is mentioned in the documentation.