fn ipow(a, b) { let r = 1; while (b > 0) { r *= a; b--; } return r; }
// a parse word that adds an operator to the compiler's tables
immediate fn pow_op() { next(); add_binop("**", 11, "ipow c"); return 0; }
pow_op

// unless (cond) stmt: a parse word that emits code itself
immediate fn unless() {
	let a;
	next();
	expect(intern("(")); rval(); plainuse(expr()); rval(); expect(intern(")"));
	emitseq(useq[0], ulen[0]);	// not
	a = hole(); op(O_JZ);		// skip the body when the condition was true
	substmt();
	setlit(a, here);
	return 0;
}
// repeat N { body }: a macro, built from token lists
immediate fn repeat() {
	let n, body, i = 0;
	next(); n = tv; next();
	body = grab();
	while (i < n) { feed(qdup(body)); i++; }
	free(d*body);
	return 0;
}
fn main() {
	put_n(2 ** 10); put_c(' '); put_n(3 + 2 ** 3 * 2); put_c(10);
	unless (1 > 2) put_s("unless ok\n");
	unless (2 > 1) put_s("wrong\n");
	repeat 3 { put_c('r'); }
	put_c(10);
	let q = quote { put_n(40 + 2); put_c(10); return 7; };
	put_n(q[0]); put_c(' ');
	put_n(eval(q)); put_c(10);
	let f = compile(q);
	put_n(f()); put_c(10);
	free(d*q);
	let defs = quote { fn sq(x) { return x * x; } };
	load(defs);
	free(d*defs);
	put_n(evals("return sq(12);")); put_c(10);
	return 0;
}