name := strings.TrimSuffix(tc.src, ".go")
		t.Run(name, func(t *testing.T) {
			t.Parallel()

			dir := newTempDir(t)
			defer dir.RemoveAll(t)

			outPath := dir.Join(name)
			mustRun(t, config.goCmdWithExperiments("build", []string{"-o", outPath, srcPath(tc.src)}, tc.experiments))

			cmd := hangProneCmd(outPath)
			if tc.wantErr {
				out, err := cmd.CombinedOutput()
				if err != nil {
					return
				}

func (c *config) goCmd(subcommand string, args ...string) *exec.Cmd {
	return c.goCmdWithExperiments(subcommand, args, nil)
}

// goCmdWithExperiments returns a Cmd that executes
// "GOEXPERIMENT=$experiments go $subcommand $args" with appropriate
// additional flags and CGO-related environment variables.
func (c *config) goCmdWithExperiments(subcommand string, args []string, experiments []string) *exec.Cmd {

		name := strings.TrimSuffix(tc.src, ".go")
		t.Run(name, func(t *testing.T) {
			t.Parallel()

			dir := newTempDir(t)
			defer dir.RemoveAll(t)

			outPath := dir.Join(name)
			mustRun(t, config.goCmdWithExperiments("build", []string{"-o", outPath, srcPath(tc.src)}, tc.experiments))

			cmd := hangProneCmd(outPath)
			if tc.memoryAccessError != "" {
				outb, err := cmd.CombinedOutput()
				out := string(outb)