struct var
*var_setstr1();
struct var
*var_setnum1();
struct var
**var_lookup1();
#define var_set(n, v) var_set1(&var_head, n, v)
#define var_setstr(n, s) var_setstr1(&var_head, n, s)
#define var_setnum(n, i) var_setnum1(&var_head, n, i)
#define var_unset(n) var_unset1(&var_head, n)
#define var_lookup(n) (*var_lookup1(&var_head, n))
#define var_walk(f, a) var_walk1(var_head, f, a)
struct var
*var_head
; /* secret, shhh */