// RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t -fmodule-map-file=%s -fsyntax-only -x c++ /dev/null 2>&1
//
// RUN: cp %s %t-duplicate.modulemap
// RUN: not %clang_cc1 -fmodules -fmodules-cache-path=%t -fmodule-map-file=%s -fmodule-map-file=%t-duplicate.modulemap -fsyntax-only -x c++ /dev/null 2>&1 | FileCheck --check-prefix=CHECK-DUPLICATE %s

// PR22299: Ensure we can produce diagnostics for duplicate modules from -fmodule-map-file=.
//
// CHECK-DUPLICATE: duplicate.modulemap:[[@LINE+2]]:8: error: redefinition of module 'foo'
// CHECK-DUPLICATE: diagnostics.modulemap:[[@LINE+1]]:8: note: previously defined here
module foo {}

//* Check that we accept BCPL comments properly, not just as an extension. */