diff --git a/dsl/src/dsl_parse.rs b/dsl/src/dsl_parse.rs
index ee06792..d81c54b 100644
--- a/dsl/src/dsl_parse.rs
+++ b/dsl/src/dsl_parse.rs
@@ -189,6 +189,21 @@ pub const fn to_digit (c: char) -> DslResult<usize> {
     Exp(usize, TokenIter<'source>),
 }
 
+impl<'source> std::fmt::Display for Value<'source> {
+    fn fmt (&self, out: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
+        write!(out, "{}", match self {
+            Nil    => String::new(),
+            Err(e) => format!("[error: {e}]"),
+            Num(n) => format!("{n}"),
+            Sym(s) => format!("{s}"),
+            Key(s) => format!("{s}"),
+            Str(s) => format!("{s}"),
+            Exp(_, e) => format!("{e:?}"),
+        });
+        Ok(())
+    }
+}
+
 impl<'source> Token<'source> {
     pub const fn new (
         source: &'source str, start: usize, length: usize, value: Value<'source>