6 bool equal(struct Expr obj1, struct Expr obj2);
8 bool nil_p(struct Expr obj);
9 bool symbol_p(struct Expr obj);
10 bool cons_p(struct Expr obj);
11 bool list_p(struct Expr obj);
13 struct Expr assoc(struct Expr key, struct Expr alist);
15 struct Expr list(Gc *gc, size_t n, ...);