for k := range fset {
			if _, found := base[k]; !found {
				if base == nil {
					base = make(methodSet)
				}
				base[k] = nil // collision
			}
		}

		current = consolidateMultiples(next)
	}

	if len(base) == 0 {
		return &emptyMethodSet
	}

	// collect methods
	var list []*Selection
	for _, m := range base {
		if m != nil {
			m.recv = T