``` unison
unique type Foo = Bar Nat
```

``` ucm

  Loading changes detected in scratch.u.

  I found and typechecked these definitions in scratch.u. If you
  do an `add` or `update`, here's how your codebase would
  change:
  
    ⍟ These new definitions are ok to `add`:
    
      type Foo

```
``` ucm
scratch/main> add

  ⍟ I've added these definitions:
  
    type Foo

scratch/main> alias.term Foo.Bar Stray.BarAlias

  Done.

```
``` unison
unique type Foo = Bar Nat Nat
```

``` ucm

  Loading changes detected in scratch.u.

  I found and typechecked these definitions in scratch.u. If you
  do an `add` or `update`, here's how your codebase would
  change:
  
    ⍟ These names already exist. You can `update` them to your
      new definition:
    
      type Foo

```
``` ucm
scratch/main> update

  Sorry, I wasn't able to perform the update, because I need all
  constructor names to be nested somewhere beneath the
  corresponding type name.
  
  The constructor Stray.BarAlias is not nested beneath the
  corresponding type name. Please either use `move` to move it,
  or if it's an extra copy, you can simply `delete` it. Then try
  the update again.

```