llvm-project/clang/test/Modules/diagnostics.modulemap

// RUN: not %clang_cc1 -fmodules -fmodules-cache-path=%t -fmodule-map-file=%S/Inputs/diagnostics-aux.modulemap -fmodule-map-file=%s -fsyntax-only -x c++ /dev/null 2>&1 | FileCheck %s

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

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

module bad_use {
  // CHECK: diagnostics.modulemap:[[@LINE+1]]:22: error: use declarations are only allowed in top-level modules
  module submodule { use foo }
}