yay! new runtime!

# The below code represents `my $a = 3; while --$a { say my $b; say $a; $b = 42 }`.

$ cat example.sic 
This is SIC v2010.08

block 'B0':
    `lexvar '$a'
    $0 = 3
    store [0, 0], $0
    `label L0
    $1 = fetch [0, 0]
    dec $1
    store [0, 0], $1
    jf $1, L1
    $2 = closure-from-block 'B1'
    call $2
    jmp L0
    `label L1

block 'B1':
    `lexvar '$b'
    $0 = fetch [0, 0]
    say $0
    $1 = fetch [-1, 0]
    say $1
    $2 = 42
    store [0, 0], $2

$ perl6 new-runtime example.sic 
Any()
2
Any()
1