From cfd98a7de22cc07d9fd6269e69235bb328be20f0 Mon Sep 17 00:00:00 2001
From: "Ralf W. Grosse-Kunstleve" <rwgk@google.com>
Date: Tue, 21 Jun 2022 17:58:43 -0700
Subject: [PATCH] Fix off-by-one in source_file_line_basename()

---
 include/pybind11/cast.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/pybind11/cast.h b/include/pybind11/cast.h
index 841d7d986..ffc5ea985 100644
--- a/include/pybind11/cast.h
+++ b/include/pybind11/cast.h
@@ -68,13 +68,13 @@ inline const char *cpp_version_in_use() {
 }
 
 inline const char *source_file_line_basename(const char *sfl) {
-    unsigned i_sep = 0;
+    unsigned i_base = 0;
     for (unsigned i = 0; sfl[i] != '\0'; i++) {
         if (sfl[i] == '/' || sfl[i] == '\\') {
-            i_sep = i;
+            i_base = i + 1;
         }
     }
-    return sfl + i_sep;
+    return sfl + i_base;
 }
 
 namespace {