1 files changed, 3 insertions, 1 deletions
diff --git a/clang/lib/Basic/Module.cpp b/clang/lib/Basic/Module.cpp
index 9a58fae..2f30fa0 100644
--- a/clang/lib/Basic/Module.cpp
+++ b/clang/lib/Basic/Module.cpp
@@ -633,7 +633,9 @@ LLVM_DUMP_METHOD void Module::dump() const {
 
 void VisibleModuleSet::setVisible(Module *M, SourceLocation Loc,
                                   VisibleCallback Vis, ConflictCallback Cb) {
-  assert(Loc.isValid() && "setVisible expects a valid import location");
+  // We can't import a global module fragment so the location can be invalid.
+  assert((M->isGlobalModule() || Loc.isValid()) &&
+         "setVisible expects a valid import location");
   if (isVisible(M))
     return;