1 files changed, 8 insertions, 0 deletions
diff --git a/src/com/craftinginterpreters/lox/Resolver.java b/src/com/craftinginterpreters/lox/Resolver.java
index cda0f60..dc7332b 100644
--- a/src/com/craftinginterpreters/lox/Resolver.java
+++ b/src/com/craftinginterpreters/lox/Resolver.java
@@ -46,6 +46,14 @@ class Resolver implements Expr.Visitor<Void>, Stmt.Visitor<Void> {
         declare(stmt.name);
         define(stmt.name);
 
+        if (stmt.superclass != null && stmt.name.lexeme.equals(stmt.superclass.name.lexeme)) {
+            Lox.error(stmt.superclass.name, "A class can't inherit from itself.");
+        }
+
+        if (stmt.superclass != null) {
+            resolve(stmt.superclass);
+        }
+
         beginScope();
         scopes.peek().put("this", true);