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Well this seems to explain why it fails, but introduces another question:

```
eips[0].allocationId.apply(a =&gt; console.log('ALLOCATION', a))
      eips[0].publicIp.apply(i =&gt; console.log('IP', i))
```

```
Diagnostics:
  aws:ec2:NatGateway (us-east-1a):
    error: aws:ec2/natGateway:NatGateway resource 'us-east-1a' has a problem: "allocation_id": required field is not set

  pulumi:pulumi:Stack (infrastructure-dev):
    IP 54.86.50.185
    ALLOCATION undefined
```

Problem solved... the allocation ID seems to be on `eip.id` and not `eip.allocationId`.

This definitely seems like either a bug in the documentation or AWS module though.

Have created an issue: <https://github.com/pulumi/pulumi-aws/issues/498>

Ugh.  Sorry i missed this.  This was something i also ran into in the past.  and it definitely is confusing

No problem, didn't take too long to figure out