print characters correctly
@@ -537,7 +537,7 @@ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
&Constant::Atom(ref atom) =>
write!(f, "{}", atom),
&Constant::Char(c) =>
- write!(f, "#\\{}", c),
+ write!(f, "{}", c as u8),
&Constant::EmptyList =>
write!(f, "[]"),
&Constant::Number(ref n) =>
