box?

src/config/error.rs

@@ -7,6 +7,7 @@ use std::{
 #[derive(Debug)]
 pub enum Error {
     IO(io::Error),
+    Syntax(sexp::Error),
 
     Unknown,
 }
@@ -17,6 +18,7 @@ impl std::error::Error for Error
     {
 	Some(match &self {
 	    Self::IO(io) => io,
+	    Self::Syntax(sy) => sy,
 	    _ => return None,
 	})
     }
@@ -27,7 +29,9 @@ impl std::fmt::Display for Error
     {
 	match self {
 	    Self::IO(io) => write!(f, "i/o error: {}", io),
-	    Self::Unknown => write!(f, "unknown error")
+	    Self::Syntax(sy) => write!(f, "s-expression syntax error: {}", sy),
+	    
+	    _ => write!(f, "unknown error")
 	}
     }
 }
@@ -40,3 +44,18 @@ impl From<io::Error> for Error
     }
 }
 
+impl From<sexp::Error> for Error
+{
+    fn from(from: sexp::Error) -> Self
+    {
+	Self::Syntax(from)
+    }
+}
+
+impl From<Box<sexp::Error>> for Error
+{
+    fn from(from: Box<sexp::Error>) -> Self
+    {
+	Self::Syntax(*from)
+    }
+}