Uses "io.println" instead of "io::println", please.

[liigo]

Dot is much easier to type than two colons (need Shift key). Most other programming language uses . instead of ::.

[marijnh]

Rust used to work this way, but we switched to :: becuase we need to be able to disambiguate modules from regular values, because modules live in a different namespace. This has already been discussed at length.