#pragma once extern sl_v sl_printreadablysym, sl_printprettysym; void sl_print(sl_v v);void sl_print_traverse(sl_v v);void sl_print_chr(char c);void sl_print_str(const char *s, bool princ) sl_nonnull(1) sl_cstr(1);void sl_print_child(sl_v v);void sl_print_init(void);