[clang] [Clang][Sema] Fix issue on requires expression with templated base class member function (PR #85198)

[Qizhi Hu via cfe-commits]

https://github.com/jcsxky updated https://github.com/llvm/llvm-project/pull/85198

>From 23a344395180cbdcd47618e3170e72260139d4b7 Mon Sep 17 00:00:00 2001
From: huqizhi <huqizhi at feysh.com>
Date: Thu, 14 Mar 2024 16:32:36 +0800
Subject: [PATCH] [Clang][Sema] Fix issue on requires expression with templated
 base class member function

---
 clang/lib/Sema/SemaExpr.cpp    |  3 ++-
 clang/test/SemaCXX/PR84020.cpp | 23 +++++++++++++++++++++++
 2 files changed, 25 insertions(+), 1 deletion(-)
 create mode 100644 clang/test/SemaCXX/PR84020.cpp

diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index 8725b09f8546cf..31df62d06f1c05 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -7729,7 +7729,8 @@ ExprResult Sema::BuildResolvedCallExpr(Expr *Fn, NamedDecl *NDecl,
   }
 
   if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl))
-    if (Method->isImplicitObjectMemberFunction())
+    if (!isa<RequiresExprBodyDecl>(CurContext) &&
+        Method->isImplicitObjectMemberFunction())
       return ExprError(Diag(LParenLoc, diag::err_member_call_without_object)
                        << Fn->getSourceRange() << 0);
 
diff --git a/clang/test/SemaCXX/PR84020.cpp b/clang/test/SemaCXX/PR84020.cpp
new file mode 100644
index 00000000000000..8ea5dcc4527ae7
--- /dev/null
+++ b/clang/test/SemaCXX/PR84020.cpp
@@ -0,0 +1,23 @@
+// RUN: %clang_cc1 -std=c++20 -verify %s
+// RUN: %clang_cc1 -std=c++23 -verify %s
+// expected-no-diagnostics
+
+struct B {
+    template <typename S>
+    void foo();
+
+    void bar();
+};
+
+template <typename T, typename S>
+struct A : T {
+    auto foo() {
+        static_assert(requires { T::template foo<S>(); });
+        static_assert(requires { T::bar(); });
+    }
+};
+
+int main() {
+    A<B, double> a;
+    a.foo();
+}