================
@@ -312,6 +317,16 @@ struct SymbolInfo : public Info {
 
   std::optional<Location> DefLoc;     // Location where this decl is defined.
   llvm::SmallVector<Location, 2> Loc; // Locations where this decl is declared.
+
+  bool operator<(const SymbolInfo &Other) const {
+    if (DefLoc && Other.DefLoc) {
+      return *DefLoc < *Other.DefLoc;
----------------
ilovepi wrote:

What if these are equal? Won't you prevent ordering elements with equal DefLocs 
based on other criteria, like Location and Name?

https://github.com/llvm/llvm-project/pull/101387
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