How to display line numbers using GitHub Flavored Markdown "code"?

Question

I know I can use "code" in GitHub Flavored Markdown to highlight a code snippet. But I am not able to display line numbers for a snippet. Is there a way to do so?

```javascript var s = "JavaScript syntax highlighting"; alert(s); ``` 

I want a line number to be put at the beginning of each line, like this:

1    var s = "JavaScript syntax highlighting"; 2    alert(s); 

Answer 1

As you may noticed in Markdown Cheatsheet, GitHub does not show line numbers in code blocks.

Answer 2

As a hack, you could save a pic of your code at https://carbon.now.sh and post it; they support line numbers as an option.