by marty.schoch:

What does 'go version' print?

go version go1.3 darwin/amd64

present version?
$ hg id -i
2b0e5133d4f3+

What steps reproduce the problem?
If possible, include a link to a program on play.golang.org.

1.  Create presentation include `.code -numbers x.go`
2.  Run present

Content demonstrating this can be found here:
https://gist.github.com/mschoch/6d974ef1cb0e0874164a

What happened?

Observe that line numbers are not shown.

What should have happened instead?

Line numbers should be shown.

Please provide any additional information below.

I have worked around the problem by adding custom css to styles.css:

.numbers span:before {
  content: attr(num);
  color: gray;
  display: block;
  float: left;
  width: 2em;
}