t1.bpl(60,5): Error: Non-interference check failed
Execution trace:
    (0,0): og_init
    t1.bpl(80,13): anon0
    t1.bpl(80,13): anon0$1
    (0,0): inline$SetG_1$0$Entry
    t1.bpl(80,13): anon0$2
    (0,0): inline$Impl_YieldChecker_A_1$1$L2

Boogie program verifier finished with 2 verified, 1 error