exec ./example.exe
stdout '^GOROOT '$TESTGO_GOROOT'$'
stdout '^runtime '$TESTGO_GOROOT${/}src${/}runtime'$'

! exec ./example-trimpath.exe
stdout '^GOROOT $'
stderr 'cannot find package "runtime" in any of:\n\t\(\$GOROOT not set\)\n\t'$WORK${/}gopath${/}src${/}runtime' \(from \$GOPATH\)\n\z'

exec ./example.test.exe -test.v
stdout '^GOROOT '$TESTGO_GOROOT'$'
stdout '^runtime '$TESTGO_GOROOT${/}src${/}runtime'$'

	GOEXE=<executable file suffix: .exe on Windows, empty on other systems>
	GOOS=<target GOOS>
	GOPATH=$WORK/gopath
	GOPROXY=<local module proxy serving from cmd/go/testdata/mod>
	GOROOT=<actual GOROOT>
	TESTGO_GOROOT=<GOROOT used to build cmd/go, for use in tests that may change GOROOT>
	HOME=/no-home
	PATH=<actual PATH>
	TMPDIR=$WORK/tmp
	GODEBUG=<actual GODEBUG>
	devnull=<value of os.DevNull>

		"GOPROXY=" + proxyURL,
		"GOPRIVATE=",
		"GOROOT=" + testGOROOT,
		"GOTRACEBACK=system",
		"TESTGONETWORK=panic", // allow only local connections by default; the [net] condition resets this
		"TESTGO_GOROOT=" + testGOROOT,
		"TESTGO_EXE=" + testGo,
		"TESTGO_VCSTEST_HOST=" + httpURL.Host,
		"TESTGO_VCSTEST_TLS_HOST=" + httpsURL.Host,
		"TESTGO_VCSTEST_CERT=" + srvCertFile,

	GOEXE=<executable file suffix: .exe on Windows, empty on other systems>
	GOOS=<target GOOS>
	GOPATH=$WORK/gopath
	GOPROXY=<local module proxy serving from cmd/go/testdata/mod>
	GOROOT=<actual GOROOT>
	TESTGO_GOROOT=<GOROOT used to build cmd/go, for use in tests that may change GOROOT>
	HOME=/no-home
	PATH=<actual PATH>
	TMPDIR=$WORK/tmp
	GODEBUG=<actual GODEBUG>
	devnull=<value of os.DevNull>

		toolchain.TestVersionSwitch = os.Getenv("TESTGO_VERSION_SWITCH")
		if v := os.Getenv("TESTGO_TOOLCHAIN_VERSION"); v != "" {
			work.ToolchainVersion = v
		}

		if testGOROOT := os.Getenv("TESTGO_GOROOT"); testGOROOT != "" {
			// Disallow installs to the GOROOT from which testgo was built.
			// Installs to other GOROOTs — such as one set explicitly within a test — are ok.
			work.AllowInstall = func(a *work.Action) error {