[Bug c++/66139] destructor not called for members of partially constructed anonymous struct/array

[ryxi at stu dot xidian.edu.cn]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66139

--- Comment #7 from Xi Ruoyao <ryxi at stu dot xidian.edu.cn> ---
std::basic_string<...> is too large.  Replace it with a dummy
default constructable and copyable class Foo.  Then get GIMPLE:

          _1 = &<retval>->a;
          _2 = std::vector<Foo>::at (&strings, 0);
          Foo::Foo (_1, _2);
          _3 = &<retval>->b;
          _4 = std::vector<Foo>::at (&strings, 2);
          Foo::Foo (_3, _4);
          return <retval>;

No exception handling code here.