Exposes underlying node libraries.

[robrighter]

s.run("1 + 1; } sys= require('sys'); sys.puts('Up in your fridge'); function foo() {", function(output) { sys.puts("Example: " + output + "\n"); });

[gf3]

I've added a fix and test case for this specific example. 4883d4ceffeb86cc7ef598d77267d0265b96f95f