[clang] [clang][Interp][NFC] Add a failing test case (PR #102801)

[Timm Baeder via cfe-commits]

https://github.com/tbaederr created https://github.com/llvm/llvm-project/pull/102801

None

>From 3085070e4e3ff4a65810123c8489cd31300b19d5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timm=20B=C3=A4der?= <tbaeder at redhat.com>
Date: Sun, 11 Aug 2024 09:48:35 +0200
Subject: [PATCH] [clang][Interp][NFC] Add a failing test case

---
 clang/test/AST/Interp/cxx20.cpp | 44 +++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/clang/test/AST/Interp/cxx20.cpp b/clang/test/AST/Interp/cxx20.cpp
index 27dbd2818be60f..389d9d883725f4 100644
--- a/clang/test/AST/Interp/cxx20.cpp
+++ b/clang/test/AST/Interp/cxx20.cpp
@@ -858,3 +858,47 @@ namespace DefinitionLoc {
   constexpr NonConstexprCopy ncc2 = ncc1; // both-error {{constant expression}} \
                                           // both-note {{non-constexpr constructor}}
 }
+
+/// FIXME: Call base dtors when explicitly calling dtor.
+namespace VirtDtor {
+  class B {
+  public:
+    constexpr B(char *p) : p(p) {}
+    virtual constexpr ~B() {
+      *p = 'B';
+      ++p;
+    }
+
+    char *p;
+  };
+
+  class C : public B {
+  public:
+    constexpr C(char *p) : B(p) {}
+    virtual constexpr ~C() override {
+      *p = 'C';
+      ++p;
+    }
+  };
+
+  union U {
+    constexpr U(char *p) : c(p) {}
+    constexpr ~U() {}
+
+    C c;
+  };
+
+  constexpr int test(char a, char b) {
+    char buff[2] = {};
+    U u(buff);
+
+    /// U is a union, so it won't call the destructor of its fields.
+    /// We do this manually here. Explicitly calling ~C() here should
+    /// also call the destructor of the base classes however.
+    u.c.~C();
+
+    return buff[0] == a && buff[1] == b;
+  }
+
+  static_assert(test('C', 'B')); // expected-error {{failed}}
+}