Accessors, byLine, input ranges

[Andrei Alexandrescu]

Michel Fortin wrote:
> Yeah, it's less likely to be a problem. But "less likely to be a 
> problem" does still does not make things reliable. Something reliable 
> works all the time, or it just doesn't work and tells you.

stream.front after stream.popFront works all the time and fetches a new 
line off the stream. Like Steve said, you can't at the same time fetch a 
line and leave it back in the stream.

Andrei