From 8c134b073dea14c7a096b4223f455fcb6efa23f3 Mon Sep 17 00:00:00 2001
From: Walter Bright <walter@walterbright.com>
Date: Sun, 21 Jun 2020 01:38:54 -0700
Subject: [PATCH] fix Issue 18734 - bitnum parameter of core.bitop.bt should be
 signed

---
 src/core/bitop.d | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core/bitop.d b/src/core/bitop.d
index b33ecc47ed..bc3a359a71 100644
--- a/src/core/bitop.d
+++ b/src/core/bitop.d
@@ -267,7 +267,7 @@ unittest
  * (No longer an intrisic - the compiler recognizes the patterns
  * in the body.)
  */
-int bt(const scope size_t* p, size_t bitnum) pure @system
+int bt(const scope size_t* p, ptrdiff_t bitnum) pure @system
 {
     static if (size_t.sizeof == 8)
         return ((p[bitnum >> 6] & (1L << (bitnum & 63)))) != 0;