Hola. Al importar con: go get golang.org/x/exp/constraints@latest Dice que: 'go get' is no longer supported outside a module. To build and install a command, use 'go install' with a version, like 'go install example.com/cmd@latest' For more information, see https://golang.org/doc/go-get-install-deprecation or run 'go help get' or 'go help install'.

Hago: go import golang.org/x/exp/constraints@latest

Y el error es: package golang.org/x/exp/constraints is not a main package

¿Cómo se puede importar? Gracias y saludos.