Grafting Functional Support on Top of an Imperative Language

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Surely there would be some sort of (detectable) cast or some such to 
"escape" a pure function for debugging?  Or maybe this just plain ol' 
relies on running a debugger (not so much fun.)

-[Unknown]


Jason House wrote:
> bearophile wrote:
>> P. 31: >writeln(i);<
>>
>> Can you put (temporary) debugging writeln/putr inside a pure function?
> 
> That's always bothered me about this stuff.  I don't want to lose
> debugging/logging ability!