// KernelAdapter::changeKernel
 76     function changeKernel(Kernel newKernel_) external onlyKernel {
 77         kernel = newKernel_;
 78     }

// Kernel::executeAction
254         } else if (action_ == Actions.MigrateKernel) {
255             ensureContract(target_);
256             _migrateKernel(Kernel(target_));
257         }
