[clang] [libcxx] [Clang] Diagnose forming references to nullptr (PR #143667)

[Corentin Jabot via cfe-commits]

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@@ -1571,6 +1572,7 @@ static bool isValidIndeterminateAccess(AccessKinds AK) {
     return false;
 
   case AK_IsWithinLifetime:
+  case AK_Dereference:
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cor3ntin wrote:

I don't think we can ever get there, but I changed it to return false

https://github.com/llvm/llvm-project/pull/143667