From 34074287861b3ef6c9ee89195056d20ae1603cfc Mon Sep 17 00:00:00 2001
From: Joel Kronqvist <joel.kronqvist@iki.fi>
Date: Sat, 26 Jul 2025 18:34:44 +0300
Subject: Added variables and tests for their substitution

---
 src/sexp/mod.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

(limited to 'src/sexp/mod.rs')

diff --git a/src/sexp/mod.rs b/src/sexp/mod.rs
index 087cb67..d866be5 100644
--- a/src/sexp/mod.rs
+++ b/src/sexp/mod.rs
@@ -1,12 +1,12 @@
 
 pub mod step;
 pub mod util;
+pub mod subst;
 
 /// A leaf node for S-Expressions.
 ///
 /// May represent built-in operators,
-/// variables (to be added), functions
-/// (to be added) or values.
+/// variables, functions (to be added) or values.
 #[derive(Debug)]
 #[derive(PartialEq)]
 pub enum SLeaf {
@@ -15,6 +15,7 @@ pub enum SLeaf {
     Mul,
     Div,
     Int(i32),
+    Var(String),
 }
 
 /// An S-Expression; the defining structure of the language.
-- 
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