Starts proof cache infra

src/parsing.rs

@@ -15,6 +15,7 @@ use crate::ast::Body;
 use crate::ast::Clause;
 use crate::ast::Module;
 use crate::ast::Predicate;
+use crate::ast::Variable;
 
 pub fn predicate_parse(input: &mut &str) -> Result<Predicate>
 {
@@ -23,7 +24,7 @@ pub fn predicate_parse(input: &mut &str) -> Result<Predicate>
     // Check if output is a variable
     if ident.chars().next().is_some_and(|char| char.is_uppercase())
     {
-        Ok(Predicate::Variable(String::from(ident)))
+        Ok(Predicate::Variable(Variable(String::from(ident), None)))
     }
     else
     {