Rejects valid direct initialization from prvalue (private destructor)

[llvmbot]

Bugzilla Link	48026
Version	unspecified
OS	Linux
Reporter	LLVM Bugzilla Contributor
CC	@zygoloid

Extended Description

clang version 10.0.1 (https://github.com/llvm/llvm-project.git ef32c61)

options: -std=c++17 -O2 -pedantic-errors

clang++ rejects the following well-formed program:

struct A {
    private:
    ~A();

    public:
    static A f();
};

A* foo() {
    return new A(A::f());
}

https://godbolt.org/z/hffYq7

On the return line no destructor is invoked or potentially invoked.

[AaronBallman]

The code is not well-formed; no compiler accepts this code: https://godbolt.org/z/9nnrhjn3s

https://eel.is/c++draft/class#dtor-14, specifically "for a constructed temporary object when its lifetime ends". A::f() results in a temporary object.

[llvmbot]

@llvm/issue-subscribers-clang-frontend

Author: None (llvmbot)

| | | | --- | --- | | Bugzilla Link | [48026](https://llvm.org/bz48026) | | Version | unspecified | | OS | Linux | | Reporter | LLVM Bugzilla Contributor | | CC | @zygoloid |

Extended Description

clang version 10.0.1 (https://github.com/llvm/llvm-project.git ef32c61)

options: -std=c++17 -O2 -pedantic-errors

clang++ rejects the following well-formed program:

struct A {
    private:
    ~A();

    public:
    static A f();
};

A* foo() {
    return new A(A::f());
}

https://godbolt.org/z/hffYq7

On the return line no destructor is invoked or potentially invoked.

[zygoloid]

I don't think that's right: no temporary object is materialized here. I don't think the destructor should be referenced in this case.