================
@@ -54,14 +54,24 @@ inline bool IsLifetimeSafetyEnabled(Sema &S, const Decl *D) 
{
   return false;
 }
 
+inline StringRef formatExpr(const Expr *E) {
+  const Expr *PureExpr = E->IgnoreImpCasts();
----------------
suoyuan666 wrote:

Hi, please take a look at my latest commit. I added `extractExpr` to extract 
the expressions that are actually needed.

My previous wording may not have been very accurate. What I meant is that 
`buildXXXChains` cannot possibly make Sema diagnostics obtain the 
`ImplicitCastExpr` and the following `DeclRefExpr` if it only does something as 
simple as `vector.push(SrcOrigin.getExpr())`.

https://github.com/llvm/llvm-project/pull/199345
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