Implement Error::new()

src/parser/mod.rs

@@ -57,7 +57,7 @@ impl Parser {
             match next.token {
                 Token::Boolean(value) => Ok(Expression::Literal(Box::new(value))),
                 Token::Character(value) => Ok(Expression::Literal(Box::new(value))),
-                _ => Err(Error { lex: next, desc: "Invalid token".to_string() })
+                _ => Err(Error::new(next, "Invalid token"))
             }
         }
         else {
@@ -71,6 +71,12 @@ pub struct Error {
     desc: String,
 }
 
+impl Error {
+    pub fn new(lex: Lex, desc: &str) -> Error {
+        Error { lex: lex, desc: desc.to_string() }
+    }
+}
+
 impl fmt::Debug for Error {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         write!(f, "PARSE ERROR: {}\n  token = {:?}", self.desc, self.lex)