Index: test/CodeGen/2018-05-20-ExpansionChecksum.c
===================================================================
--- /dev/null
+++ test/CodeGen/2018-05-20-ExpansionChecksum.c
@@ -0,0 +1,10 @@
+// RUN: %clang -c -gdwarf-5 %s  -o /dev/null
+// Don't crash calculating the checksum of string.h
+#if __has_include("/usr/include/string.h")
+#define __NTH fct
+void fn1() {}
+# 7 "/usr/include/string.h"
+#if 8
+void __NTH() {}
+#endif
+#endif