diff --git a/clang/test/CodeGen/debug-prefix-map.cpp b/clang/test/CodeGen/debug-prefix-map.cpp
new file mode 100644
--- /dev/null
+++ b/clang/test/CodeGen/debug-prefix-map.cpp
@@ -0,0 +1,11 @@
+// RUN: %clang++ -g -fdebug-prefix-map=%p=./UNLIKELY_PATH/empty -S -c %s -emit-llvm -o - | FileCheck %s --check-prefix=CHECK-REL
+
+struct alignas(64) an {
+  struct {
+    unsigned char x{0};
+  } arr[64];
+};
+
+struct an *pan = new an;
+
+// CHECK-REL: !DISubprogram(name: "(unnamed struct at ./UNLIKELY_PATH/empty{{/|\\\\}}{{.*}}",