protocol for using InputRanges

[Tommi]

On Sunday, 23 March 2014 at 07:54:12 UTC, Jonathan M Davis wrote:
>
> If calling front were destructive, that would break a lot of 
> code.

I thought that "breaking existing code" meant either "causing 
existing code do something it wasn't supposed to do" or "causing 
existing code not compile", but you're using it in the meaning of 
"making existing code not conform to the language specification". 
Are you sure that's the correct use of the expression?