Running nixpkgs-update (https://nix-community.org/update-bot/) with UPDATE_INFO: cxx-rs 1.0.194 -> 1.0.200 https://github.com/dtolnay/cxx/releases
attrpath: cxx-rs
Checking auto update branch...
No auto update branch exists
[version] 
[version] updated version and sha256
[rustCrateVersion] 
[rustCrateVersion] No cargoHash found
[golangModuleVersion] 
[golangModuleVersion] Not a buildGoModule package with vendorHash
[npmDepsVersion] 
[npmDepsVersion] No npmDepsHash
[updateScript] 
[updateScript] skipping because derivation has no updateScript
Diff after rewrites:
diff --git a/pkgs/by-name/cx/cxx-rs/package.nix b/pkgs/by-name/cx/cxx-rs/package.nix
index 2387f706e8e2..db8777821fd2 100644
--- a/pkgs/by-name/cx/cxx-rs/package.nix
+++ b/pkgs/by-name/cx/cxx-rs/package.nix
@@ -8,13 +8,13 @@
 
 rustPlatform.buildRustPackage (finalAttrs: {
   pname = "cxx-rs";
-  version = "1.0.194";
+  version = "1.0.200";
 
   src = fetchFromGitHub {
     owner = "dtolnay";
     repo = "cxx";
     tag = finalAttrs.version;
-    sha256 = "sha256-PIeF9VuyJOIs1x02YETKIP0+nCG3RZXLMJdFNlgAFzo=";
+    sha256 = "sha256-hGTsNQ34dffZSZ+ZJYxMwnzpxO1L7+xotFi5VQpNcqw=";
   };
 
   cargoLock.lockFile = ./Cargo.lock;

Received ExitFailure 1 when running
Raw command: nix-build --option sandbox true --arg config "{ allowUnfree = true; allowAliases = false; }" --arg overlays "[ ]" -A cxx-rs
nix build failed.
got build log for 'cxx-rs' from 'daemon'
Running phase: unpackPhase
@nix { "action": "setPhase", "phase": "unpackPhase" }
unpacking source archive /nix/store/2sjbvxzgprpxjms9mfiykz2jdnhdvihk-source
source root is source
Executing cargoSetupPostUnpackHook
Finished cargoSetupPostUnpackHook
Running phase: patchPhase
@nix { "action": "setPhase", "phase": "patchPhase" }
Executing cargoSetupPostPatchHook
Validating consistency between /build/source/Cargo.lock and /build/cargo-vendor-dir/Cargo.lock
Finished cargoSetupPostPatchHook
Running phase: updateAutotoolsGnuConfigScriptsPhase
@nix { "action": "setPhase", "phase": "updateAutotoolsGnuConfigScriptsPhase" }
Running phase: configurePhase
@nix { "action": "setPhase", "phase": "configurePhase" }
Running phase: buildPhase
@nix { "action": "setPhase", "phase": "buildPhase" }
Executing cargoBuildHook
cargoBuildHook flags: -j 16 --target x86_64-unknown-linux-gnu --offline --profile release --workspace --exclude=demo
error: failed to select a version for the requirement `syn = "^3"`
candidate versions found which didn't match: 2.0.117
location searched: directory source `/build/cargo-vendor-dir` (which is replacing registry `crates-io`)
required by package `cxx-build v1.0.200 (/build/source/bridge/build)`
note: perhaps a crate was updated and forgotten to be re-vendored?
note: offline mode (via `--offline`) can sometimes cause surprising resolution failures
help: if this error is too confusing you may wish to retry without `--offline`