rb_io_check_initialized  372 ext/readline/readline.c         rb_io_check_initialized(ifp = RFILE(rb_io_taint_check(readline_instream))->fptr);
rb_io_check_initialized  381 ext/readline/readline.c         rb_io_check_initialized(ofp = RFILE(rb_io_taint_check(readline_outstream))->fptr);
rb_io_check_initialized  380 file.c             rb_io_check_initialized(fptr);
rb_io_check_initialized  140 include/ruby/io.h void rb_io_check_initialized(rb_io_t*);
rb_io_check_initialized  641 io.c               rb_io_check_initialized(fptr);
rb_io_check_initialized  651 io.c               rb_io_check_initialized(fptr);
rb_io_check_initialized 5719 io.c               rb_io_check_initialized(fptr);