--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libinterp/corefcn/panic.h	Sat Mar 23 13:17:02 2024 -0400
@@ -0,0 +1,59 @@
+////////////////////////////////////////////////////////////////////////
+//
+// Copyright (C) 2024 The Octave Project Developers
+//
+// See the file COPYRIGHT.md in the top-level directory of this
+// distribution or <https://octave.org/copyright/>.
+//
+// This file is part of Octave.
+//
+// Octave 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, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Octave 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 Octave; see the file COPYING.  If not, see
+// <https://www.gnu.org/licenses/>.
+//
+////////////////////////////////////////////////////////////////////////
+
+#if ! defined (octave_panic_h)
+#define octave_panic_h 1
+
+#include "octave-config.h"
+
+#include <cstdarg>
+
+OCTAVE_NORETURN
+extern OCTINTERP_API void vpanic (const char *fmt, va_list args);
+
+OCTAVE_FORMAT_PRINTF (1, 2)
+OCTAVE_NORETURN
+extern OCTINTERP_API void panic (const char *fmt, ...);
+
+// To allow the __FILE__ and __LINE__ macros to work as expected, the
+// panic_impossible, panic_if, panic_unless, error_impossible, error_if,
+// and error_unless symbols must be defined as macros.
+
+#define panic_impossible()                                              \
+  ::panic ("impossible state reached in file '%s' at line %d", __FILE__, __LINE__)
+
+#if defined (NDEBUG)
+#  define panic_if(cond)
+#else
+#  define panic_if(cond) do { if (cond) panic_impossible (); } while (0)
+#endif
+
+#if defined (NDEBUG)
+#  define panic_unless(cond)
+#else
+#  define panic_unless(cond) panic_if (! (cond))
+#endif
+
+#endif