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(Vload_source_file_function): New variable.
(Fload): Call Vload_source_file_function if defined while loading
an Emacs Lisp source file.  */
(read_multibyte): New function.
(read_escape): Handle multibyte characters.
(read1): Correct the value of size_in_chars of a bool vector.
Handle the case `?' is followed by a multibyte character.
(Vload_source_file_function): New variable.