================
@@ -3071,6 +3073,45 @@ struct EmbedAnnotationData {
 /// Registry of pragma handlers added by plugins
 using PragmaHandlerRegistry = llvm::Registry<PragmaHandler>;
 
+/// Module/Partition name token sequance.
+///
+///     module-name:
+///           module-name-qualifier[opt] identifier
+///
+///     module-name-qualifier
+///           module-name-qualifier[opt] identifier .
+class ModuleNameInfo {
+  friend class Preprocessor;
+  ArrayRef<Token> ModuleName;
+  ArrayRef<Token> PartitionName;
+
+  ModuleNameInfo(ArrayRef<Token> Module, ArrayRef<Token> Partition)
+      : ModuleName(Module), PartitionName(Partition) {}
+
+public:
+  ArrayRef<Token> getTokens() const {
+    if (ModuleName.empty())
+      return PartitionName;
+    if (PartitionName.empty())
+      return ModuleName;
+    return ArrayRef(ModuleName.begin(), PartitionName.end());
----------------
ChuanqiXu9 wrote:

This makes me slightly surprise. Could you explain why it is valid?

https://github.com/llvm/llvm-project/pull/90574
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