[clang-tools-extra] [clang-tidy][NFC] Add test case confirming #190944 is fixed (PR #192707)

[Victor Chernyakin via cfe-commits]

https://github.com/localspook created https://github.com/llvm/llvm-project/pull/192707

Closes #190944.

This issue is already fixed, and this change just adds a test case to confirm that.


>From 6f3ec7af6b9a0c306436daac81537459d8ec24f7 Mon Sep 17 00:00:00 2001
From: Victor Chernyakin <chernyakin.victor.j at outlook.com>
Date: Fri, 17 Apr 2026 10:49:15 -0700
Subject: [PATCH] [clang-tidy][NFC] Add test case confirming #190944 is fixed

---
 .../checkers/readability/redundant-typename.cpp      | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/clang-tools-extra/test/clang-tidy/checkers/readability/redundant-typename.cpp b/clang-tools-extra/test/clang-tidy/checkers/readability/redundant-typename.cpp
index 56ff9813cd6ae..6a3745ea36d64 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/readability/redundant-typename.cpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/readability/redundant-typename.cpp
@@ -366,3 +366,15 @@ typename T::R Foo::PartiallySpecializedDataMember<T, typename T::V> = false;
 // CHECK-FIXES-20: T::R Foo::PartiallySpecializedDataMember<T, typename T::V> = false;
 
 #endif // __cplusplus >= 201402L
+
+struct Int {
+  using R = int;
+};
+
+template <typename T>
+struct BaseClass {};
+
+template <typename T>
+struct SubClass : BaseClass</* This used to be a false positive. */ typename T::R> {};
+
+template struct SubClass<Int>;