unison/unison-src/transcripts/fix4515.md

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```ucm:hide
myproject/main> builtins.merge
```
```unison
unique type Foo = Foo1
unique type Bar = X Foo
unique type Baz = X Foo
useBar : Bar -> Nat
useBar = cases
Bar.X _ -> 1
```
```ucm
myproject/main> add
```
```unison
unique type Foo = Foo1 | Foo2
```
```ucm
myproject/main> update
```