rb_io_check_initialized  171 file.c             rb_io_check_initialized(fptr);
rb_io_check_initialized  151 include/ruby/io.h void rb_io_check_initialized(rb_io_t*);
rb_io_check_initialized  242 io.c               rb_io_check_initialized(fptr);
rb_io_check_initialized  266 io.c               rb_io_check_initialized(RFILE(io)->fptr);
rb_io_check_initialized 3330 io.c               rb_io_check_initialized(fptr);
rb_io_check_initialized 4367 io.c               rb_io_check_initialized(fptr);