fix(natu): preserve NixOS cfg bindings

src/natu/natu_test.rs

@@ -65,6 +65,18 @@ fn natu_reports_out_of_order_let_bindings() -> googletest::Result<()> {
     Ok(())
 }
 
+#[gtest]
+fn natu_preserves_nixos_cfg_bindings() -> googletest::Result<()> {
+    let report = natu::future_sight(vec![SourceFile {
+        path: PathBuf::from("configs/nixos/test.nix"),
+        source: "{ config, ... }: let\n  cfg = config.example;\n  value = cfg;\nin value\n".into(),
+    }])
+    .or_fail()?;
+
+    expect_that!(report.is_clean(), is_true());
+    Ok(())
+}
+
 #[gtest]
 fn natu_reports_unquoted_uri() -> googletest::Result<()> {
     let report = natu::future_sight(vec![fixture_source("testdata/lint_findings.nix")?]).or_fail()?;