================
@@ -12448,9 +12448,9 @@ static void DiagnoseBadDeduction(Sema &S, NamedDecl 
*Found, Decl *Templated,
                                      TemplateSpecCandidateSetKind::Normal) {
   TemplateParameter Param = DeductionFailure.getTemplateParameter();
   NamedDecl *ParamD;
-  (ParamD = Param.dyn_cast<TemplateTypeParmDecl*>()) ||
-  (ParamD = Param.dyn_cast<NonTypeTemplateParmDecl*>()) ||
-  (ParamD = Param.dyn_cast<TemplateTemplateParmDecl*>());
+  (ParamD = dyn_cast_if_present<TemplateTypeParmDecl *>(Param)) ||
+      (ParamD = dyn_cast_if_present<NonTypeTemplateParmDecl *>(Param)) ||
+      (ParamD = dyn_cast_if_present<TemplateTemplateParmDecl *>(Param));
----------------
nikic wrote:

While you are here, I would rewrite this weird pattern as a sequences of `if 
(!ParamD) ...`

https://github.com/llvm/llvm-project/pull/225319
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