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diff --git a/builtins/builtin.def b/builtins/builtin.def
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+This file is builtin.def, from which is created builtin.c.
+It implements the builtin "builtin" in Bash.
+
+Copyright (C) 1987-2017 Free Software Foundation, Inc.
+
+This file is part of GNU Bash, the Bourne Again SHell.
+
+Bash 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.
+
+Bash 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 Bash.  If not, see <http://www.gnu.org/licenses/>.
+
+$PRODUCES builtin.c
+
+$BUILTIN builtin
+$FUNCTION builtin_builtin
+$SHORT_DOC builtin [shell-builtin [arg ...]]
+Execute shell builtins.
+
+Execute SHELL-BUILTIN with arguments ARGs without performing command
+lookup.  This is useful when you wish to reimplement a shell builtin
+as a shell function, but need to execute the builtin within the function.
+
+Exit Status:
+Returns the exit status of SHELL-BUILTIN, or false if SHELL-BUILTIN is
+not a shell builtin.
+$END
+#include <config.h>
+
+#if defined (HAVE_UNISTD_H)
+#  ifdef _MINIX
+#    include <sys/types.h>
+#  endif
+#  include <unistd.h>
+#endif
+
+#include "../shell.h"
+#include "../execute_cmd.h"
+#include "common.h"
+#include "bashgetopt.h"
+
+/* Run the command mentioned in list directly, without going through the
+   normal alias/function/builtin/filename lookup process. */
+int
+builtin_builtin (list)
+     WORD_LIST *list;
+{
+  sh_builtin_func_t *function;
+  register char *command;
+
+  if (no_options (list))
+    return (EX_USAGE);
+  list = loptend;	/* skip over possible `--' */
+
+  if (list == 0)
+    return (EXECUTION_SUCCESS);
+
+  command = list->word->word;
+#if defined (DISABLED_BUILTINS)
+  function = builtin_address (command);
+#else /* !DISABLED_BUILTINS */
+  function = find_shell_builtin (command);
+#endif /* !DISABLED_BUILTINS */
+
+  if (function == 0)
+    {
+      sh_notbuiltin (command);
+      return (EXECUTION_FAILURE);
+    }
+  else
+    {
+      this_command_name = command;
+      this_shell_builtin = function;	/* overwrite "builtin" as this builtin */
+      list = list->next;
+      return ((*function) (list));
+    }
+}