r[i] = v + v
	}
	return r
}

type MySlice []int

var _ = Double(MySlice{1})

// From the draft design.

type Setter[B any] interface {
	Set(string)
	*B
}

func FromStrings[T interface{}, PT Setter[T]](s []string) []T {
	result := make([]T, len(s))
	for i, v := range s {
		// The type of &result[i] is *T which is in the type set
		// of Setter, so we can convert it to PT.
		p := PT(&result[i])

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package main

import (
	"fmt"
	"strconv"
)

// Various implementations of fromStrings().

type Setter[B any] interface {
	Set(string)
	*B
}

// Takes two type parameters where PT = *T
func fromStrings1[T any, PT Setter[T]](s []string) []T {
	result := make([]T, len(s))