[frontend] When preprocessing, turn implicit module imports into @imports.
part of rdar://13610250
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179144 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Preprocessor/pp-modules.c b/test/Preprocessor/pp-modules.c
new file mode 100644
index 0000000..c6c3ecc
--- /dev/null
+++ b/test/Preprocessor/pp-modules.c
@@ -0,0 +1,11 @@
+// RUN: rm -rf %t
+// RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t -x objective-c %s -F %S/../Modules/Inputs -E -o - | FileCheck %s
+
+// CHECK: int bar();
+int bar();
+// CHECK: @import Module; /* clang -E: implicit import for "{{.*Headers[/\\]Module.h}}" */
+#include <Module/Module.h>
+// CHECK: int foo();
+int foo();
+// CHECK: @import Module; /* clang -E: implicit import for "{{.*Headers[/\\]Module.h}}" */
+#include <Module/Module.h>