================
@@ -450,6 +453,16 @@ 
CrossTranslationUnitContext::ASTUnitStorage::getASTUnitForFile(
   }
 }
 
+const MacroExpansionContext *
+CrossTranslationUnitContext::ASTUnitStorage::getMacroExpansionsForUnit(
+    const ASTUnit *Unit) const {
+  auto UnitMacroExpansions = UnitMacroExpansionsMap.find(Unit);
+  if (UnitMacroExpansions != UnitMacroExpansionsMap.end()) {
+    return UnitMacroExpansions->second.get();
+  }
+  return nullptr;
----------------
steakhal wrote:

Wouldn't `.lookup()` do this for you?

https://github.com/llvm/llvm-project/pull/176126
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