https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100901

            Bug ID: 100901
           Summary: "error: array used as initializer" on compiling
                    coroutine with initializer list with shared_ptr in it
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: greed at ispsystem dot com
  Target Milestone: ---

I got same error on all compiler versions that support coroutines. To reproduce
it compile it with following params `-std=c++20 -fcoroutines`

#include <coroutine>
#include <memory>

using std::suspend_never;

auto test_ptr(std::initializer_list<std::shared_ptr<int>> values) {
    return suspend_never{};
}
struct testing {
    struct promise_type {
        testing get_return_object() { return {}; }
        void return_void() {}
        suspend_never initial_suspend() noexcept { return {}; }
        suspend_never final_suspend() noexcept { return {}; }
        void unhandled_exception() { std::terminate(); }
    };
};
testing demo() {
    co_await test_ptr({std::make_shared<int>(1)});
}

int main() {
    demo();
}

https://godbolt.org/z/47sjsaxMa

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