feat(tvix/nix-compat-derive): Add deriver for NixDeserialize r/8586

This adds a nix-compat-derive derive crate that implements a deriver
for NixDeserialize implementations. This is to reduce the amount of
code needed to implement deserialization for all the types used by
the Nix daemon protocol.

Change-Id: I484724b550e8a1d5e9adad9555d9dc1374ae95c2
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12022
Autosubmit: Brian Olsen <me@griff.name>
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>

1 files changed, 13 insertions, 0 deletions

diff --git a/tvix/nix-compat-derive-tests/tests/ui/deserialize_enum_non_exaustive.rs b/tvix/nix-compat-derive-tests/tests/ui/deserialize_enum_non_exaustive.rs
new file mode 100644
index 000000000000..ab559f2b81c8
--- /dev/null
+++ b/tvix/nix-compat-derive-tests/tests/ui/deserialize_enum_non_exaustive.rs
@@ -0,0 +1,13 @@
+use nix_compat_derive::NixDeserialize;
+
+#[derive(NixDeserialize)]
+pub enum Test {
+    #[nix(version = "..=10")]
+    Old,
+    #[nix(version = "15..=17")]
+    Legacy,
+    #[nix(version = "50..")]
+    NewWay,
+}
+
+fn main() {}