From 2a40eb6086cf10d1c3f148db6c5906b0aaa2ff90 Mon Sep 17 00:00:00 2001
From: Chris Mihelich <cmihelic@google.com>
Date: Thu, 6 Jun 2024 13:57:54 -0700
Subject: Demangle C++20 constrained friend names, F (<source-name> |
 <operator-name>).

PiperOrigin-RevId: 641011959
Change-Id: I844d4eb99a9f9da160bb53e491dee753a70750df
---
 absl/debugging/internal/demangle_test.cc | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

(limited to 'absl/debugging/internal/demangle_test.cc')

diff --git a/absl/debugging/internal/demangle_test.cc b/absl/debugging/internal/demangle_test.cc
index 1d108c8b..68ab8a3c 100644
--- a/absl/debugging/internal/demangle_test.cc
+++ b/absl/debugging/internal/demangle_test.cc
@@ -160,6 +160,34 @@ TEST(Demangle, ConstrainedAutoInFunctionTemplate) {
   EXPECT_STREQ(tmp, "f<>()");
 }
 
+TEST(Demangle, ConstrainedFriendFunctionTemplate) {
+  char tmp[100];
+
+  // Source:
+  //
+  // namespace ns {
+  // template <class T> struct Y {
+  //   friend void y(Y) requires true {}
+  // };
+  // }  // namespace ns
+  //
+  // y(ns::Y<int>{});
+  //
+  // LLVM demangling:
+  //
+  // ns::Y<int>::friend y(ns::Y<int>) requires true
+  ASSERT_TRUE(Demangle("_ZN2ns1YIiEF1yES1_QLb1E", tmp, sizeof(tmp)));
+  EXPECT_STREQ(tmp, "ns::Y<>::friend y()");
+}
+
+TEST(Demangle, ConstrainedFriendOperatorTemplate) {
+  char tmp[100];
+
+  // ns::Y<int>::friend operator*(ns::Y<int>) requires true
+  ASSERT_TRUE(Demangle("_ZN2ns1YIiEFdeES1_QLb1E", tmp, sizeof(tmp)));
+  EXPECT_STREQ(tmp, "ns::Y<>::friend operator*()");
+}
+
 TEST(Demangle, NonTemplateBuiltinType) {
   char tmp[100];
 
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