From 99ccfe440890425f0eb83d09c91c4f51fa83d73e Mon Sep 17 00:00:00 2001
From: David Sherret <dsherret@gmail.com>
Date: Tue, 3 Mar 2026 14:25:05 +0100
Subject: [PATCH] fix: improve error retreiving cargo metadata

---
 lib/manifest.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/manifest.ts b/lib/manifest.ts
index 461b441..d1b421a 100644
--- a/lib/manifest.ts
+++ b/lib/manifest.ts
@@ -50,10 +50,14 @@ export async function getCargoWorkspace(
     cwd: directory.toString(),
     args: ["metadata", "--format-version", "1", ...cargoFlags],
     stdout: "piped",
+    stderr: "piped",
   });
   const output = await p.output();
   if (!output.success) {
-    throw new Error("Error retrieving cargo metadata.");
+    const stderr = new TextDecoder().decode(output.stderr).trim();
+    throw new Error(
+      `Error retrieving cargo metadata.\n${stderr}`,
+    );
   }
   const result = new TextDecoder().decode(output.stdout);
   return new CargoWorkspace(JSON.parse(result!) as CargoMetadata);