compilation error: static assertion failed: exec::task<T> cannot be co_await-ed in a coroutine that does not have an associated start scheduler

[SamGaaWaa]

#include <exec/task.hpp>

template <class T>
using Task = exec::basic_task<T, exec::__task::inline_task_context<T>>;

Task<void> coro() {
    co_return;
}

Task<void> test() {
    co_await coro();
}

int main() {
    stdexec::sync_wait(test());
}

opt/compiler-explorer/libs/stdexec/trunk/include/exec/task.hpp:68:21: error: static assertion failed: exec::task<T> cannot be co_await-ed in a coroutine that does not have an associated start scheduler.
   68 |       static_assert(__indirect_start_scheduler_provider<_ParentPromise>,
      |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/opt/compiler-explorer/libs/stdexec/trunk/include/exec/task.hpp:120:42: note: in instantiation of function template specialization 'experimental::execution::__task::__parent_promise_has_start_scheduler<experimental::execution::__task::basic_task<void, experimental::execution::__task::__default_task_context_impl<experimental::execution::__task::__scheduler_affinity::__none>>::__promise>' requested here
  120 |         if constexpr (__with_affinity && __parent_promise_has_start_scheduler<_ParentPromise>())
      |                                          ^
/opt/compiler-explorer/libs/stdexec/trunk/include/exec/../stdexec/__detail/__manual_lifetime.hpp:51:30: note: in instantiation of function template specialization 'experimental::execution::__task::__default_task_context_impl<experimental::execution::__task::__scheduler_affinity::__none>::__default_task_context_impl<experimental::execution::__task::basic_task<void, experimental::execution::__task::__default_task_context_impl<experimental::execution::__task::__scheduler_affinity::__none>>::__promise>' requested here
   51 |                              _Ty{static_cast<_Args&&>(__args)...});
      |                              ^
/opt/compiler-explorer/libs/stdexec/trunk/include/exec/../stdexec/__detail/__optional.hpp:108:30: note: in instantiation of function template specialization 'stdexec::__manual_lifetime<experimental::execution::__task::__default_task_context_impl<experimental::execution::__task::__scheduler_affinity::__none>>::__construct<experimental::execution::__task::basic_task<void, experimental::execution::__task::__default_task_context_impl<experimental::execution::__task::__scheduler_affinity::__none>>::__promise &>' requested here
  108 |         _Tp& __t  = __value_.__construct(static_cast<_Us&&>(__us)...);
      |                              ^
/opt/compiler-explorer/libs/stdexec/trunk/include/exec/task.hpp:633:40: note: in instantiation of function template specialization 'stdexec::__opt::__optional<experimental::execution::__task::__default_task_context_impl<experimental::execution::__task::__scheduler_affinity::__none>>::emplace<experimental::execution::__task::basic_task<void, experimental::execution::__task::__default_task_context_impl<experimental::execution::__task::__scheduler_affinity::__none>>::__promise &>' requested here
  633 |           __coro_.promise().__context_.emplace(__parent.promise());
      |                                        ^
<source>:11:5: note: in instantiation of function template specialization 'experimental::execution::__task::basic_task<void, experimental::execution::__task::__default_task_context_impl<experimental::execution::__task::__scheduler_affinity::__none>>::__task_awaiter<experimental::execution::__task::basic_task<void, experimental::execution::__task::__default_task_context_impl<experimental::execution::__task::__scheduler_affinity::__none>>::__promise>::await_suspend<experimental::execution::__task::basic_task<void, experimental::execution::__task::__default_task_context_impl<experimental::execution::__task::__scheduler_affinity::__none>>::__promise>' requested here
   11 |     co_await coro();
      |     ^
/opt/compiler-explorer/libs/stdexec/trunk/include/exec/task.hpp:68:21: note: because 'experimental::execution::__task::basic_task<void, experimental::execution::__task::__default_task_context_impl<experimental::execution::__task::__scheduler_affinity::__none>>::__promise' does not satisfy '__indirect_start_scheduler_provider'
   68 |       static_assert(__indirect_start_scheduler_provider<_ParentPromise>,
      |                     ^
/opt/compiler-explorer/libs/stdexec/trunk/include/exec/task.hpp:62:9: note: because 'get_start_scheduler(get_env(t))' would be invalid: no matching function for call to object of type 'const get_start_scheduler_t'
   62 |       { get_start_scheduler(get_env(t)) } -> scheduler;
      |         ^
1 error generated.
Compiler returned: 1