src/go/parser/testdata/set.go2

// Package set implements sets of any type.
package set

type Set[Elem comparable] map[Elem]struct{}

func Make[Elem comparable]() Set[Elem] {
	return make(Set(Elem))
}

func (s Set[Elem]) Add(v Elem) {
	s[v] = struct{}{}
}

func (s Set[Elem]) Delete(v Elem) {
	delete(s, v)
}

func (s Set[Elem]) Contains(v Elem) bool {
	_, ok := s[v]
	return ok
}

func (s Set[Elem]) Len() int {
	return len(s)
}

func (s Set[Elem]) Iterate(f func(Elem)) {
	for v := range s {
		f(v)
	}
}