================
@@ -7379,6 +7379,14 @@ class RecoveryExpr final : public Expr,
   friend class ASTStmtWriter;
 };
 
+/// Insertion operator for diagnostics.  This allows sending
+/// Expr into a diagnostic with <<.
+inline const StreamingDiagnostic &operator<<(const StreamingDiagnostic &DB,
+                                             const Expr *E) {
+  DB.AddTaggedVal(reinterpret_cast<uint64_t>(E), DiagnosticsEngine::ak_expr);
----------------
erichkeane wrote:

We probably SHOULD, and you can do so without review if you care to.  Else, we 
can just make @shafik do this, since he started it.

https://github.com/llvm/llvm-project/pull/134693
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