handle non-list cases in '', add '' as a built-in (re: issue #31)

2018-05-01 10:11:27 -06:00
parent 516b67460d
commit 0458a70527
5 changed files with 24 additions and 8 deletions
--- a/src/prolog/ast.rs
+++ b/src/prolog/ast.rs
@@ -537,7 +537,7 @@ impl fmt::Display for Constant {
            &Constant::Atom(ref atom) =>
                write!(f, "{}", atom),
            &Constant::Char(c) =>
-                write!(f, "{}", c as u8),
+                write!(f, "'{}'", c as u8),
            &Constant::EmptyList =>
                write!(f, "[]"),
            &Constant::Number(ref n) =>