From e8fceff49dc2414536a7deeb2adc6ffbfc7d413e Mon Sep 17 00:00:00 2001
From: Zuhaitz Méndez Fernández de Aránguiz <zuhaitz@debian>
Date: Tue, 13 Jan 2026 00:56:29 +0000
Subject: Support for #15

---
 std/string.zc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/std/string.zc b/std/string.zc
index c3bf4ac..e45d399 100644
--- a/std/string.zc
+++ b/std/string.zc
@@ -58,7 +58,7 @@ impl String {
     
     fn substring(self, start: usize, len: usize) -> String {
         if (start + len > self.length()) {
-            printf("Panic: substring out of bounds\n");
+            fprintf(stderr, "%s:%d (%s): Panic: substring out of bounds\n", __FILE__, __LINE__, __func__);
             exit(1);
         }
         var v = Vec<char>::new();
-- 
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