func reflect.AppendSlice

3 uses

	reflect (current package)
		value.go#L2058: func AppendSlice(s, t Value) Value {

	github.com/imdario/mergo
		merge.go#L186: 			newSlice = reflect.AppendSlice(dst, src)

	google.golang.org/api/iterator
		iterator.go#L225: 	e.Set(reflect.AppendSlice(e, reflect.ValueOf(p.pageInfo.takeBuf())))