stderr 'go: downloading go1.20 '


# check for invalid GOTOOLCHAIN
env GOTOOLCHAIN=go1.14
go version
stdout 'go1.14'

env GOTOOLCHAIN=go1.20
! go version
stderr 'go: downloading go1.20 '

env GOTOOLCHAIN=go1.21
! go version
stderr 'go: invalid toolchain: go1.21 is a language version but not a toolchain version \(go1.21.x\)'

env GOTOOLCHAIN=go1.22
! go version

# Test query for non-defaults in the env

env GOROOT=./a
env GOTOOLCHAIN=local
env GOSUMDB=nodefault
env GOPROXY=nodefault
env GO111MODULE=auto
env CGO_CFLAGS=nodefault
env CGO_CPPFLAGS=nodefault

go env -changed
# linux output like GOTOOLCHAIN='local'
# windows output like GOTOOLCHAIN=local
stdout 'GOTOOLCHAIN=''?local''?'
stdout 'GOSUMDB=''?nodefault''?'
stdout 'GOPROXY=''?nodefault''?'
stdout 'GO111MODULE=''?auto''?'

stdout go1.21pre3

# GOTOOLCHAIN=go1.50.0
env GOTOOLCHAIN=go1.50.0
! go version
stderr 'running go1.50.0 from PATH'

# GOTOOLCHAIN=path with toolchain line
env GOTOOLCHAIN=local
go mod init m
go mod edit -toolchain=go1.50.0
grep go1.50.0 go.mod
env GOTOOLCHAIN=path
! go version
stderr 'running go1.50.0 from PATH'

# GOTOOLCHAIN=path with go line
env GOTOOLCHAIN=local
go mod edit -toolchain=none -go=1.50.0

	}
	return "go" + latest, nil
}

// HasAuto reports whether the GOTOOLCHAIN setting allows "auto" upgrades.
func HasAuto() bool {
	env := cfg.Getenv("GOTOOLCHAIN")
	return env == "auto" || strings.HasSuffix(env, "+auto")
}

// HasPath reports whether the GOTOOLCHAIN setting allows "path" upgrades.
func HasPath() bool {
	env := cfg.Getenv("GOTOOLCHAIN")
	return env == "path" || strings.HasSuffix(env, "+path")

	GOHOSTARCH
	GOHOSTOS
	GOINSECURE
	GOMIPS
	GOMIPS64
	GOMODCACHE
	GONOPROXY
	GONOSUMDB
	GOOS
	GOPATH
	GOPPC64
	GOPRIVATE
	GOPROXY
	GORISCV64
	GOROOT
	GOSUMDB
	GOTMPDIR
	GOTOOLCHAIN
	GOTOOLDIR
	GOVCS
	GOWASM
	GOWORK
	GO_EXTLINK_ENABLED
	PKG_CONFIG