Eigen/src/SparseCore/InternalHeaderCheck.h - eigen - Git at Google

 // SPDX-FileCopyrightText: The Eigen Authors
 // SPDX-License-Identifier: MPL-2.0

 #ifndef EIGEN_SPARSECORE_MODULE_H
 #error "Please include Eigen/SparseCore instead of including headers inside the src directory directly."
 #endif
	// SPDX-FileCopyrightText: The Eigen Authors
	// SPDX-License-Identifier: MPL-2.0

	#ifndef EIGEN_SPARSECORE_MODULE_H
	#error "Please include Eigen/SparseCore instead of including headers inside the src directory directly."
	#endif