var TestVersion string

// Local returns the local Go version, the one implemented by this go command.
func Local() string {
	v, _ := local()
	return v
}

// LocalToolchain returns the local toolchain name, the one implemented by this go command.
func LocalToolchain() string {
	_, t := local()
	return t
}

func local() (goVers, toolVers string) {
	toolVers = runtime.Version()
	if TestVersion != "" {
		toolVers = TestVersion

	// so that we have initialized gover.Startup for use in error messages.
	if target := os.Getenv(targetEnv); target != "" && TestVersionSwitch != "loop" {
		if gover.LocalToolchain() != target {
			base.Fatalf("toolchain %v invoked to provide %v", gover.LocalToolchain(), target)
		}
		os.Unsetenv(targetEnv)

		// Note: It is tempting to check that if gotoolchain != "local"
		// then target == gotoolchain here, as a sanity check that

				mainModule,
				{Path: "go", Version: goVersion},
				{Path: "toolchain", Version: gover.LocalToolchain()},
			}
		} else {
			goVersion = gover.Local()
			pruning = pruningForGoVersion(goVersion)
			roots = []module.Version{
				{Path: "go", Version: goVersion},
				{Path: "toolchain", Version: gover.LocalToolchain()},
			}
		}
		rawGoVersion.Store(mainModule, goVersion)