nix-super/src/libstore/dummy-store.md

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R"(
**Store URL format**: `dummy://`
This store type represents a store that contains no store paths and
cannot be written to. It's useful when you want to use the Nix
evaluator when no actual Nix store exists, e.g.
```console
# nix eval --store dummy:// --expr '1 + 2'
```
)"