[llvm-bugs] [Bug 37833] New: Abstract class in function return type

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=37833

            Bug ID: 37833
           Summary: Abstract class in function return type
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: zhonghao at pku.org.cn
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

The code is as follow:

template<typename T>
struct S{};

struct A
{
 virtual void f() = 0;
};

int main()
{
 S<A(int)> s;
}

An abstract class shall not be used as a function return type, but clang++
accepts the code. 

The code comes from a gcc bug report
(https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51184).

A previous version of gcc also accepts the code, but it is fixed already.

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