pragma_c_code_dup_var.m:025: Error: function `bread_impl'/7 has no clauses.
pragma_c_code_dup_var.m:050: In `:- pragma foreign_proc' declaration for
pragma_c_code_dup_var.m:050:   function `bread_impl'/7:
pragma_c_code_dup_var.m:050:   error: variable `Buf' occurs more than once in
pragma_c_code_dup_var.m:050:   the argument list.