Check in LLVM r95781.
diff --git a/test/CodeGen/writable-strings.c b/test/CodeGen/writable-strings.c
new file mode 100644
index 0000000..693fa5e
--- /dev/null
+++ b/test/CodeGen/writable-strings.c
@@ -0,0 +1,8 @@
+// RUN: %clang_cc1 -emit-llvm -o - -fwritable-strings %s
+
+int main() {
+    char *str = "abc";
+    str[0] = '1';
+    printf("%s", str);
+}
+