[clang] [Clang] Implement P0963R3 "Structured binding declaration as a condition" (PR #130228)

[Timm Baeder via cfe-commits]

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@@ -4285,6 +4290,8 @@ class DecompositionDecl final
                                             std::move(Bindings));
   }
 
+  bool isDecisionVariable() const { return IsDecisionVariable; }
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tbaederr wrote:

Can you add docs here explaining what this means?

https://github.com/llvm/llvm-project/pull/130228