move current_input_line to lexical_feedback class * input.h, input.cc, lex.h, lex.ll (current_input_line): Declare as member of lexical_feedback class. (octave_base_reader::octave_gets, octave_terminal_reader::get_input, octave_file_reader::get_input, octave_eval_string_reader::get_input): Don't set current_input_line. (octave_lexer::read): Set current_input_line. * oct-parse.in.yy (octave_parser::bison_error): Use curr_lexer->current_input_line.