Commit e94384a915dd1233795fd8b36fda0db1d7519453

Revert "Support more complex code blocks as argument to `run-in-thread"

This reverts commit a54548174153cb02b366fe6164cf3aa30597759c.
  
203203 }
204204 current_thread->initial_specpdl = Qnil;
205205
206 Feval (current_thread->func);
206 Ffuncall (1, &current_thread->func);
207207 return unbind_to (count, Qnil);
208208}
209209