1 files changed, 23 insertions, 3 deletions
diff --git a/src/modules/ast/syntax-tree.scm b/src/modules/ast/syntax-tree.scm
index 738b115..b7db8dd 100644
--- a/src/modules/ast/syntax-tree.scm
+++ b/src/modules/ast/syntax-tree.scm
@@ -15,7 +15,16 @@
 
             make-expr
             expr?
-            expr-int
+            expr-type
+
+            make-unary
+            unary?
+            unary-operator
+            unary-expr
+
+            make-const
+            const?
+            const-int
 
             make-id
             id?
@@ -38,9 +47,20 @@
   (expr stmt-expr))
 
 (define-record-type <expr>
-  (make-expr int)
+  (make-expr type)
   expr?
-  (int expr-int))
+  (type expr-type))
+
+(define-record-type <unary>
+  (make-unary op expr)
+  unary?
+  (op unary-operator)
+  (expr unary-expr))
+
+(define-record-type <const>
+  (make-const int)
+  const?
+  (int const-int))
 
 (define-record-type <id>
   (make-id symbol)