Small bug repro program for shiny win32 memory corruption issue

repro.go

// Run over and over again until bug appears.
// Takes less than a minute on my system.
//
// I used a bash script like so:
//
// #!/bin/bash -e
// while true; do
//   ./repro.exe
// done

package main

import (
    "fmt"
    "os"
    "time"

    "golang.org/x/exp/shiny/driver/windriver"
    "golang.org/x/exp/shiny/screen"
)

func main() {

    // mock data usage
    {
        obj := []float64{}
        const size1 = 1024*1024*10
        for i := 0; i < size1; i++ {
            obj = append(obj, float64(i))
        }
        const size2 = 1024*1024*10
        data := make([]float64, size2)
        for i := range data {
            data[i] = float64(i)
        }
    }

    image := make([]byte, 640*360*4)

    windriver.Main(func(s screen.Screen) {

        _, err := s.NewWindow(&screen.NewWindowOptions{
            Width:  10,
            Height: 10,
        })
        if err != nil {
            fmt.Println("err opening window:", err)
            os.Exit(1)
        }

        startTime := time.Now()
        lastChecksum := 0

        for {
            for i := range image {
                image[i] = 0
            }

            for i := range image {
                image[i] = byte(i)
            }

            checksum := 0
            for i := range image {
                checksum += int(image[i])
            }
            if lastChecksum != 0 && lastChecksum != checksum {
                fmt.Println("memory corruption!")
                os.Exit(1)
            }
            lastChecksum = checksum

            if time.Now().Sub(startTime) > 333*time.Millisecond {
                os.Exit(0)
            }
        }
    })
}