Zcoin implementation bug enabled attacker to create 548,000 Zcoins

[Walter Bright via Digitalmars-d]

https://makebitcoingreatagain.wordpress.com/2017/02/18/is-the-zcoin-bug-in-checktransaction/#update6

The error is here:

     https://github.com/zcoinofficial/zcoin/blob/81a667867b5d8489...

and the line of code:

     zccoinSpend.denomination == libzerocoin::ZQ_LOVELACE;

In other words, a statement with no effect. In D, such a line gives an error, 
not a warning:

     Error: == has no effect in expression