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diff --git a/circuitpython/py/objfun.h b/circuitpython/py/objfun.h
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+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * SPDX-FileCopyrightText: Copyright (c) 2013, 2014 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#ifndef MICROPY_INCLUDED_PY_OBJFUN_H
+#define MICROPY_INCLUDED_PY_OBJFUN_H
+
+#include "py/obj.h"
+
+typedef struct _mp_obj_fun_bc_t {
+    mp_obj_base_t base;
+    mp_obj_dict_t *globals;         // the context within which this function was defined
+    const byte *bytecode;           // bytecode for the function
+    const mp_uint_t *const_table;   // constant table
+    #if MICROPY_PY_SYS_SETTRACE
+    const struct _mp_raw_code_t *rc;
+    #endif
+    // the following extra_args array is allocated space to take (in order):
+    //  - values of positional default args (if any)
+    //  - a single slot for default kw args dict (if it has them)
+    mp_obj_t extra_args[];
+} mp_obj_fun_bc_t;
+
+void mp_obj_fun_bc_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest);
+
+#endif // MICROPY_INCLUDED_PY_OBJFUN_H