hashicorp/terraform — pull request #714 by svanharmelen (2014-12-25 20:59:12+00:00)
Title: provider/aws: fixing aws-instance schema

Some instance types have a block device by default. So when selecting such an instance type, you will not set a config for the block device, but the update/refresh func will notice one and update the state nonetheless.

So in those cases the `block_device` becomes a `computed` field.