[clang] [Clang] Implement P2718R0 "Lifetime extension in range-based for loops" (PR #76361)

[via cfe-commits]

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@@ -1357,6 +1363,19 @@ class Sema final {
     // VLAs).
     bool InConditionallyConstantEvaluateContext = false;
 
+    /// Whether we are currently in a context in which temporaries must be
+    /// lifetime-extended (Eg. in a for-range initializer).
+    bool IsInLifetimeExtendingContext = false;
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yronglin wrote:

agree

https://github.com/llvm/llvm-project/pull/76361
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