Codechange: replace error/usererror printf variant with fmt variant and rename

src/error.cpp

@@ -0,0 +1,21 @@
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
+ * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file error.cpp Reporting of errors. */
+
+#include "stdafx.h"
+#include "error_func.h"
+
+void NORETURN NotReachedError(int line, const char *file)
+{
+	FatalError("NOT_REACHED triggered at line {} of {}", line, file);
+}
+
+void NORETURN AssertFailedError(int line, const char *file, const char *expression)
+{
+	FatalError("Assertion failed at line {} of {}: {}", line, file, expression);
+}