[clang-tools-extra] UseStructuredBindingCheck.cpp - fix MSVC "not all control paths return a value" warning. NFC. (PR #179206)

[Simon Pilgrim via cfe-commits]

https://github.com/RKSimon created https://github.com/llvm/llvm-project/pull/179206

None

>From 774d62a3eb48dd4d6c2dd6d34c78be31f6d3fa91 Mon Sep 17 00:00:00 2001
From: Simon Pilgrim <llvm-dev at redking.me.uk>
Date: Mon, 2 Feb 2026 10:53:47 +0000
Subject: [PATCH] UseStructuredBindingCheck.cpp - fix MSVC "not all control
 paths return a value" warning. NFC.

---
 .../clang-tidy/modernize/UseStructuredBindingCheck.cpp           | 1 +
 1 file changed, 1 insertion(+)

diff --git a/clang-tools-extra/clang-tidy/modernize/UseStructuredBindingCheck.cpp b/clang-tools-extra/clang-tidy/modernize/UseStructuredBindingCheck.cpp
index b56fb0579f1e3c..8dd6bbfa3d2ab7 100644
--- a/clang-tools-extra/clang-tidy/modernize/UseStructuredBindingCheck.cpp
+++ b/clang-tools-extra/clang-tidy/modernize/UseStructuredBindingCheck.cpp
@@ -348,6 +348,7 @@ void UseStructuredBindingCheck::check(const MatchFinder::MatchResult &Result) {
       case TT_ByConstRef:
         return "const auto&";
       }
+      llvm_unreachable("Unhandled TransferType enum");
     }();
 
     const std::string ReplacementText =