Use gimme to fetch Go Modules-enabled Go version:
$ GIMME_GO_VERSION=1.12.4 gimme
unset GOOS;
unset GOARCH;
export GOROOT='/home/vytas/.gimme/versions/go1.12.4.linux.amd64';
export PATH="/home/vytas/.gimme/versions/go1.12.4.linux.amd64/bin:${PATH}";
go version >&2;
export GIMME_ENV="/home/vytas/.gimme/envs/go1.12.4.env"