[clang] [Clang][RFC] Do not eat SFINAE diagnostics for explicit template arguments (PR #139066)

[Corentin Jabot via cfe-commits]

================
@@ -12166,6 +12174,15 @@ static void DiagnoseBadDeduction(Sema &S, NamedDecl 
*Found, Decl *Templated,
              diag::note_ovl_candidate_explicit_arg_mismatch_unnamed)
           << (index + 1);
     }
+
+    if (PartialDiagnosticAt *PDiag = DeductionFailure.getSFINAEDiagnostic()) {
+      unsigned DiagID =
----------------
cor3ntin wrote:

Maybe we should just emit them as errors and leave a TODO for @Sirraide to fix 
in once they get nested errors to work?

https://github.com/llvm/llvm-project/pull/139066
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