================
@@ -434,6 +478,26 @@ StringRef DiagnosticIDs::getDescription(unsigned DiagID) 
const {
   return CustomDiagInfo->getDescription(DiagID).GetDescription();
 }
 
+/// getStableID - Given a diagnostic ID, return the stable ID of the 
diagnostic.
+std::string DiagnosticIDs::getStableID(unsigned DiagID) const {
+  if (const StaticDiagInfoRec *Info = GetDiagInfo(DiagID))
+    return Info->getStableID().str();
+  assert(CustomDiagInfo && "Invalid CustomDiagInfo");
+  // TODO: Stable IDs for custom diagnostics?
+  return std::to_string(DiagID);
----------------
dbartol wrote:

I've expanded the comments with a little more detail about how to handle this. 
We should really just get rid of the remaining custom diagnostics.

https://github.com/llvm/llvm-project/pull/168153
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