Zcoin implementation bug enabled attacker to create 548, 000 Zcoins

[Ivan Kazmenko via Digitalmars-d]

On Thursday, 9 March 2017 at 15:42:22 UTC, qznc wrote:
> I'm curious. Where does it make sense for opEquals to be 
> non-pure? Likewise opCmp, etc.

An example would be tracking the number of comparisons made.  
This sounds like debug information (and then, debug statement can 
be used to escape purity), but perhaps may be applied beyond 
simple debugging and profiling.

Ivan Kazmenko.