unison/unison-src/transcripts/upgrade-sad-path.md

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Markdown

```ucm:hide
.> project.create-empty proj
proj/main> builtins.merge
proj/main> move.namespace builtin lib.builtin
```
```unison
lib.old.foo = 17
lib.new.foo = +18
thingy = lib.old.foo + 10
```
```ucm
proj/main> add
```
```ucm:error
proj/main> upgrade old new
```