Replace derive-macro Display impl with manual formatting

1 files changed, 12 insertions, 1 deletions

diff --git a/mingling_core/src/program/error.rs b/mingling_core/src/program/error.rs
index 5e92a42..a6874cf 100644
--- a/mingling_core/src/program/error.rs
+++ b/mingling_core/src/program/error.rs
@@ -4,11 +4,22 @@ use thiserror::Error;
 
 /// Error type returned when a panic occurs during execution.
 #[derive(Error)]
-#[error("execution panicked: {payload:?}")]
 pub struct ProgramPanic {
     pub payload: Box<dyn Any + Send>,
 }
 
+impl fmt::Display for ProgramPanic {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        if let Some(s) = self.payload.downcast_ref::<&str>() {
+            write!(f, "{}", s)
+        } else if let Some(s) = self.payload.downcast_ref::<String>() {
+            write!(f, "{}", s)
+        } else {
+            write!(f, "")
+        }
+    }
+}
+
 impl ProgramPanic {
     pub fn new(payload: Box<dyn Any + Send>) -> Self {
         ProgramPanic { payload }