env TESTGO_VERSION=go1.28-devel
go mod init example.com
cmp go.mod go.mod.want-1.26.0
rm go.mod
env TESTGO_VERSION=go1.26.0
go mod init example.com
cmp go.mod go.mod.want-1.25.0
rm go.mod
env TESTGO_VERSION=go1.22.2
go mod init example.com
cmp go.mod go.mod.want-1.21.0
rm go.mod
env TESTGO_VERSION=go1.25.0-xyzzy
go mod init example.com
cmp go.mod go.mod.want-1.24.0
rm go.mod
env TESTGO_VERSION=go1.23rc3
go mod init example.com
cmp go.mod go.mod.want-1.21.0
rm go.mod
env TESTGO_VERSION=go1.18beta2
go mod init example.com
cmp go.mod go.mod.want-1.16.0
-- go.mod.want-1.26.0 --
module example.com

go 1.26.0
-- go.mod.want-1.25.0 --
module example.com

go 1.25.0
-- go.mod.want-1.24.0 --
module example.com

go 1.24.0
-- go.mod.want-1.22.0 --
module example.com

go 1.22.0
-- go.mod.want-1.21.0 --
module example.com

go 1.21.0
-- go.mod.want-1.16.0 --
module example.com

go 1.16.0