foo.bpl(30,3): Error: Non-interference check failed
Execution trace:
    foo.bpl(7,3): anon0
    (0,0): anon00
    foo.bpl(14,3): inline$Incr_1$0$A
    (0,0): inline$Impl_YieldChecker_PC_1$0$L0

Boogie program verifier finished with 9 verified, 1 error