[clang] [Clang] CWG2789 Overload resolution with implicit and explicit object… (PR #73493)

[Vlad Serebrennikov via cfe-commits]

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@@ -0,0 +1,31 @@
+// RUN: %clang_cc1 -std=c++2c -verify %s
+
+
+namespace dr2789 { // dr2789: 18 open
+
+template <typename T = int>
+struct Base {
+    constexpr void g(); // expected-note {{candidate function}}
+};
+
+template <typename T = int>
+struct Base2 {
+    constexpr void g() requires true;  // expected-note {{candidate function}}
+};
+
+template <typename T = int>
+struct S : Base<T>, Base2<T> {
+    constexpr void f();                      // #1
+    constexpr void f(this S&) requires true{}; // #2
+
+    using Base<T>::g;
+    using Base2<T>::g;
+};
+
+void test() {
+    S<> s;
+    s.f();
+    s.g(); // expected-error {{call to member function 'g' is ambiguous}}
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Endilll wrote:

I believe our current best practices on handling errors with notes in DR tests are showcased here: https://github.com/llvm/llvm-project/blob/fe3c4218438adeebba4914a57b4d382e3a947394/clang/test/CXX/drs/dr13xx.cpp#L505
Notes being scattered across the test makes it harder to match the test against compiler output on e.g. Compiler Explorer.

https://github.com/llvm/llvm-project/pull/73493