```ucm:hide
myproj/main> builtins.merge
```

```unison
lib.foo0.lib.bonk1.bar = 203
lib.foo0.baz = 1
lib.foo1.zonk = 204
lib.foo1.lib.bonk2.qux = 1
mybar = bar + bar
```

```ucm:error
myproj/main> add
myproj/main> upgrade foo0 foo1
```