@begin: scope:[]  from
  [0] phi()
  to:@1
@1: scope:[]  from @begin
  [1] phi()
  [2] call main 
  to:@end
@end: scope:[]  from @1
  [3] phi()
main: scope:[main]  from @1
  [4] phi()
  to:main::@1
main::@1: scope:[main]  from main main::@2
  [5] (byte) main::i#2 ← phi( main/(byte) 0 main::@2/(byte) main::i#1 )
  to:main::@2
main::@2: scope:[main]  from main::@1
  [6] (byte) main::i#1 ← ++ (byte) main::i#2
  [7] (byte~) main::$0 ← (byte) main::i#1 & (byte) 1
  [8] (byte~) main::$2 ← (byte~) main::$0 << (byte) 1
  [9] (void()*) main::f#0 ← *((const void()*[2]) fns#0 + (byte~) main::$2)
  [10] call *((void()*) main::f#0) 
  to:main::@1
fn2: scope:[fn2]  from
  [11] *((const byte*) fn2::BGCOL#0) ← ++ *((const byte*) fn2::BGCOL#0)
  to:fn2::@return
fn2::@return: scope:[fn2]  from fn2
  [12] return 
  to:@return
fn1: scope:[fn1]  from
  [13] *((const byte*) fn1::BORDERCOL#0) ← ++ *((const byte*) fn1::BORDERCOL#0)
  to:fn1::@return
fn1::@return: scope:[fn1]  from fn1
  [14] return 
  to:@return
