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[Sema] Fix lifetime extension for temporaries in range-based for loops in C++23 #145164

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@mrcvtl mrcvtl commented Jun 21, 2025

C++23 mandates that temporaries used in range-based for loops are lifetime-extended
to cover the full loop. This patch adds a check for loop variables and compiler-
generated __range bindings to apply the correct extension.

Includes test cases based on examples from CWG900/P2644R1.

Fixes #109793

…s in C++23

C++23 mandates that temporaries used in range-based for loops are lifetime-extended
to cover the full loop. This patch adds a check for loop variables and compiler-
generated `__range` bindings to apply the correct extension.

Includes test cases based on examples from CWG900/P2644R1.
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@frederick-vs-ja
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Could you associate this PR with the issue to fix, if any?

@mrcvtl
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mrcvtl commented Jun 21, 2025

Could you associate this PR with the issue to fix, if any?

Done!

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Unnecessary warning for the fixed range-based for loop in C++23
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