//ww:run
// #59.8: a variadic call through a struct fn-pointer FIELD with a
// spread-forwarded tail (`v.cb(v, args...)`). The pre-fix wwstage
// classified the callee by NAME: with no registry hit the raw
// N_SPREAD leaked to pushargsrev as a single $0 word (callee saw
// args.ptr=0), and when the base local shadowed the module name it
// picked the module fn's signature and mis-counted nfixed.
package main;

type vt = struct {
	cb: fn(v: *vt, args: i64...) void,
	acc: i64,
};

fn sum(v: *vt, args: i64...) void = {
	let i: i32 = 0;
	for (i < args.len) {
		v.acc += args[i];
		i += 1;
	};
};

fn dispatch(v: *vt, args: i64...) void = {
	v.cb(v, args...);
};

fn main() i32 = {
	let v: vt;
	v.cb = sum;
	v.acc = 0i64;
	dispatch(&v, 1i64, 2i64, 3i64);
	if (v.acc != 6i64) { return 1; };
	v.cb(&v, 10i64);
	if (v.acc != 16i64) { return 2; };
	return 0;
};