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PR fortran/16404 (parts ported from g95) * parse.h (gfc_state_data): New field do_variable. (gfc_check_do_variable): Add prototype. * parse.c (push_state): Initialize field 'do_variable'. (gfc_check_do_variable): New function. (parse_do_block): Remember do iterator variable. (parse_file): Initialize field 'do_variable'. * match.c (gfc_match_assignment, gfc_match_do, gfc_match_allocate, gfc_match_nullify, gfc_match_deallocate): Add previously missing checks. (gfc_match_return): Reformat error message. * io.c (match_out_tag): New function. (match_open_element, match_close_element, match_file_element, match_dt_element): Call match_out_tag instead of match_vtag where appropriate. (match_io_iterator, match_io_element): Add missing check. (match_io): Reformat error message. (match_inquire_element): Call match_out_tag where appropriate. From-SVN: r84793
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