Index: clang/lib/Analysis/UnsafeBufferUsage.cpp
===================================================================
--- clang/lib/Analysis/UnsafeBufferUsage.cpp
+++ clang/lib/Analysis/UnsafeBufferUsage.cpp
@@ -1537,6 +1537,8 @@
       if (EndOfOperand)
         return FixItList{{FixItHint::CreateInsertion(
             *EndOfOperand, ".data()")}};
+      // FIXME: Points inside a macro expansion.
+      break;
     }
       [[fallthrough]];
     case Strategy::Kind::Wontfix:
Index: clang/test/SemaCXX/warn-unsafe-buffer-usage-test-unreachable.cpp
===================================================================
--- /dev/null
+++ clang/test/SemaCXX/warn-unsafe-buffer-usage-test-unreachable.cpp
@@ -0,0 +1,8 @@
+// RUN: %clang_cc1 -std=c++20 -Wunsafe-buffer-usage -fsafe-buffer-usage-suggestions -verify %s
+
+// expected-no-diagnostics
+
+typedef unsigned __darwin_size_t;
+typedef __darwin_size_t size_t;
+ #define bzero(s, n) __builtin_bzero(s, n)
+void __nosan_bzero(void *dst, size_t sz) { bzero(dst, sz); }