Domains test

src/ast.rs

@@ -2,6 +2,8 @@ use owo_colors::{OwoColorize, colors::css::Gray};
 
 use std::fmt::Display;
 
+use crate::domain::Domain;
+
 #[derive(Clone, PartialEq, Eq, Debug, Hash)]
 pub struct Variable(pub String, pub Option<usize>);
 
@@ -31,6 +33,7 @@ pub enum Predicate
 {
     Variable(Variable), // Upercase variable like X
     Fixed(Functor, Vec<Predicate>),
+    Domain(Domain),
 }
 
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
@@ -135,6 +138,7 @@ impl Display for Predicate
                     Ok(())
                 }
             }
+            Predicate::Domain(domain) => write!(f, "{domain}"),
         }
     }
 }
@@ -174,6 +178,7 @@ impl Display for Functor
         }
     }
 }
+
 impl Display for Operator
 {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result