From c6eb1ab2c9956dc594e28f3f897db490db4687b1 Mon Sep 17 00:00:00 2001
From: LordBaryhobal <lordbaryhobal@gmail.com>
Date: Fri, 6 Feb 2026 15:09:53 +0100
Subject: [PATCH] feat(resolver): add error when re-declaring a variable

---
 src/interpreter/resolver.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/interpreter/resolver.py b/src/interpreter/resolver.py
index 002ff13..abcb179 100644
--- a/src/interpreter/resolver.py
+++ b/src/interpreter/resolver.py
@@ -31,7 +31,10 @@ class Resolver(Expr.Visitor[None], Stmt.Visitor[None]):
     def declare(self, name: Token) -> None:
         if len(self.scopes) == 0:
             return
-        self.scopes[-1][name.lexeme] = False
+        scope: dict[str, bool] = self.scopes[-1]
+        if name.lexeme in scope:
+            Pebble.token_error(name, "A variable with this name is already declared in this scope.")
+        scope[name.lexeme] = False
 
     def define(self, name: Token) -> None:
         if len(self.scopes) == 0: