Attribute Macro main 

#[main]

Available on crate feature bank only.

Mark the entry point (bank 0, the root of the call stack).

The runtime calls the entry with no token, so it assumes a GroupZero token and drives banked code directly. Because it is the root, leaving a bank mapped after a call is harmless (the next call switches again).

It expands to #[gb_rt::entry] around the rewritten body, so do not apply that attribute as well, and give the function the signature gb-rt requires: fn() -> !.

Examples

#[bank::main]
pub fn main() -> ! {
    sound::play(60).drive();    // banked function: driven with `.drive()`
    update(0).drive();          // bank-0 helper: also `.drive()`
    loop {}
}