[llvm-bugs] [Bug 47449] New: std::tuple constructor template auto deduction fails with a class F that has a ctor F(std::tuple<F>)

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47449

            Bug ID: 47449
           Summary: std::tuple constructor template auto deduction fails
                    with a class F that has a ctor F(std::tuple<F>)
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: kirshamir at gmail.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

struct F {
    F() {}
    F(const std::tuple<F>&) {}
};

int main() {
    // ok: std::tuple<F>
    std::tuple t1{F{}};

    // ok: std::tuple<std::tuple<F>>
    std::tuple<std::tuple<F>> t2 = std::make_tuple(t1);

    // should be std::tuple<std::tuple<F>> but fails with stdlibc++
    std::tuple t3 = std::make_tuple(t1);
}

// Code in compiler explorer: https://godbolt.org/z/qGrcav

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