I'm following the gRPC Quickstart tutorial for Go, <https://grpc.io/docs/quickstart/go/>, and have installed gRPC using the command

```
go get -u google.golang.org/grpc

```

I actually haven't defined a `GOPATH` environment variable:

```
> echo $GOPATH

```

which, as I understand it, means that it defaults to `~/go`, or in my case `/Users/kurt/go`.

At the next step, I'd like to build the example by doing

```
cd $GOPATH/src/google.golang.org/grpc/examples/helloworld

```

However, I find that the directory doesn't exist, and there is also no `google.golang.org` directory in `/Users/kurt/go/src`:

```
~/g/src> ls *google*
fish: No matches for wildcard '*google*'. See `help expand`.
ls *google*
   ^

```

Should the package not be located here? That's what I understand from [Where does go get install packages?](https://stackoverflow.com/questions/50633092/where-does-go-get-install-packages).