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diff --git a/source/core.hpp b/source/core.hpp
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+// sprit-forth: A portable subroutine-threaded Forth.
+// Copyright (C) 2023  Clyne Sullivan <clyne@bitgloo.com>
+//
+// This library is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Library General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or (at your
+// option) any later version.
+//
+// This library 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 Library General Public License for
+// more details.
+//
+// You should have received a copy of the GNU Library General Public License
+// along with this library; if not, write to the Free Software Foundation, Inc.,
+// 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.
+
+#ifndef CORE_HPP
+#define CORE_HPP
+
+#include "types.hpp"
+
+extern void getinput();
+
+constexpr auto fexit = WordWrap<[] {
+    extern FuncList IP;
+    extern Cell *RP;
+    IP = reinterpret_cast<FuncList>(*RP--);
+}>();
+
+void jump(FuncList ip);
+void jumper();
+void compileliteral();
+
+bool haskey();
+void addkey(int k);
+
+int key();
+Cell *comma(Cell n);
+Addr aligned(Addr addr);
+void align();
+void word();
+void colon();
+void semic();
+void tick();
+
+#endif // CORE_HPP
+