--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/Rewriter/rewrite-function-decl.mm	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,31 @@
+// RUN: %clang_cc1 -fms-extensions -rewrite-objc -fobjc-runtime=macosx-fragile-10.5 -x objective-c++ -fblocks -o - %s
+
+extern "C" __declspec(dllexport) void BreakTheRewriter(void) {
+        __block int aBlockVariable = 0;
+        void (^aBlock)(void) = ^ {
+                aBlockVariable = 42;
+        };
+        aBlockVariable++;
+        void (^bBlocks)(void) = ^ {
+                aBlockVariable = 43;
+        };
+        void (^c)(void) = ^ {
+                aBlockVariable = 44;
+        };
+
+}
+__declspec(dllexport) extern "C" void AnotherBreakTheRewriter(int *p1, double d) {
+
+        __block int bBlockVariable = 0;
+        void (^aBlock)(void) = ^ {
+                bBlockVariable = 42;
+        };
+        bBlockVariable++;
+        void (^bBlocks)(void) = ^ {
+                bBlockVariable = 43;
+        };
+        void (^c)(void) = ^ {
+                bBlockVariable = 44;
+        };
+
+}