fix: include stderr in error message when helper fails

Previously, the exit status code was shown, not stderr.

Sponsored-by: author

1 files changed, 1 insertions, 1 deletions

diff --git a/src/lib.rs b/src/lib.rs
index 40ae760..c7c3bc5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -61,7 +61,7 @@ pub enum DiagramError {
     ///
     /// This probably implies there's something wrong in the filter.
     /// Please report this error.
-    #[error("helper program failed: {0} (as {1}): {2}")]
+    #[error("helper program failed: {0} (as {1}), exit status {2}:\n{3}")]
     HelperFailed(String, PathBuf, String, String),
 
     /// I/O error