[clang] [clang-tools-extra] [clang] Implement CWG2398 provisional TTP matching to class templates (PR #94981)

[Matheus Izvekov via cfe-commits]

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@@ -1198,6 +1198,18 @@ void TextNodeDumper::dumpBareTemplateName(TemplateName TN) {
     dumpTemplateName(STS->getReplacement(), "replacement");
     return;
   }
+  case TemplateName::DeducedTemplate: {
+    OS << " deduced";
+    const DeducedTemplateStorage *DTS = TN.getAsDeducedTemplateName();
+    dumpTemplateName(DTS->getUnderlying(), "underlying");
+    AddChild("defaults", [=] {
+      auto [StartPos, Args] = DTS->getDefaultArguments();
+      OS << " start " << StartPos;
+      for (const TemplateArgument &Arg : Args)
+        AddChild([=] { Visit(Arg, SourceRange()); });
+    });
+    return;
+  }
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mizvekov wrote:

Yeah, this could be tested in ast-dump tests before we restricted this to partial ordering. Now it only helps in debugging there.

https://github.com/llvm/llvm-project/pull/94981