feat(core): Display for EvalError + ParserError

lispers-core/src/parser/token.rs

@@ -1,3 +1,5 @@
+use std::fmt::Display;
+
 #[derive(Debug, PartialEq, Clone)]
 /// Sum type of different tokens
 pub enum Token {
@@ -12,3 +14,20 @@ pub enum Token {
     Symbol(String),
     True,
 }
+
+impl Display for Token {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Token::FloatLiteral(x) => write!(f, "{}", x),
+            Token::IntLiteral(x) => write!(f, "{}", x),
+            Token::Dot => write!(f, "."),
+            Token::Nil => write!(f, "nil"),
+            Token::ParClose => write!(f, ")"),
+            Token::ParOpen => write!(f, "("),
+            Token::Quote => write!(f, "'"),
+            Token::StringLiteral(x) => write!(f, "\"{}\"", x),
+            Token::Symbol(x) => write!(f, "{}", x),
+            Token::True => write!(f, "true"),
+        }
+    }
+}