@begin: scope:[]  from
  [0] phi()
  to:@1
@1: scope:[]  from @begin
  [1] phi()
  [2] call main 
  to:@end
@end: scope:[]  from @1
  [3] phi()

(void()) main()
main: scope:[main]  from @1
  asm { sei  }
  [5] *((const void()**) KERNEL_IRQ) ← &interrupt(KERNEL_KEYBOARD)(void()) irq()
  asm { cli  }
  to:main::@return
main::@return: scope:[main]  from main
  [7] return 
  to:@return

interrupt(KERNEL_KEYBOARD)(void()) irq()
irq: scope:[irq]  from
  [8] *((const byte*) BGCOL) ← (const byte) WHITE
  [9] *((const byte*) BGCOL) ← (const byte) BLACK
  to:irq::@return
irq::@return: scope:[irq]  from irq
  [10] return 
  to:@return
