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

[Younan Zhang 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 =
----------------
zyn0217 wrote:

>  I dont' really know what that looks like and might require a bit of a trip 
> through the DiagnosticsEngine

SGTM. I'll look into it and come back with an answer

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