Not working in module mode

I am trying to run github.com/kortschak/graphprac on my local machine. I always run with module mode on, Go version 1.13.

When I try to run the first cell of the notebook at that repo I get a failure that the build with buildmode=plugin failed. When I execute this in a terminal to investigate I see that it's because the go tool expects the go.mod file to exist and bails otherwise. Creating a go mod file in that directory allows the build to complete and also allows the cell to execute on the notebook.

Perhaps the go.mod from imported packages' modules could be placed in the gomacro build paths.

At the very least, it should be noted that it might be necessary to invoke the server with `GO111MODULE=off jupyter notebook`.