No output from the first code

[bcodus]

I'm trying the first code in the getting started docs, but get no output:

package main

import (
        "fmt"
        "log"

        "gorgonia.org/gorgonia"
)

func main() {
        g := gorgonia.NewGraph()

        var x, y, z *gorgonia.Node
        var err error

        // define the expression
        x = gorgonia.NewScalar(g, gorgonia.Float64, gorgonia.WithName("x"))
        y = gorgonia.NewScalar(g, gorgonia.Float64, gorgonia.WithName("y"))
        if z, err = gorgonia.Add(x, y); err != nil {
                log.Fatal(err)
        }

        // create a VM to run the program on
        machine := gorgonia.NewTapeMachine(g)
        defer machine.Close()

        // set initial values then run
        gorgonia.Let(x, 2.0)
        gorgonia.Let(y, 2.5)
        if err = machine.RunAll(); err != nil {
                log.Fatal(err)
        }

        fmt.Printf("%v", z.Value())
}

At the first build that I got this panic message

panic: Something in this program imports go4.org/unsafe/assume-no-moving-gc to declare that it assumes a non-moving garbage collector, but your version of go4.org/unsafe/assume-no-moving-gc hasn't been updated to assert that it's safe against the go1.18 runtime. If you want to risk it, run with environment variable ASSUME_NO_MOVING_GC_UNSAFE_RISK_IT_WITH=go1.18 set. Notably, if go1.18 adds a moving garbage collector, this program is unsafe to use.

So I ran

get -u go4.org/unsafe/assume-no-moving-gc

and then go mod tidy but now there is no output at runtime. Nor do I get any errors in build or runtime.

How can I fix this?

[chewxy]

This looks like a version issue

[bh90210]

relates to #523