@safe console input?

[XavierAP via Digitalmars-d-learn]

I was surprised by a compiler message saying that 
std.stdio.readln() (and specifically the overload without 
arguments) is not safe but @system.

Actually I was using it only to pause execution until the user 
presses Enter. So how else could I do this within a @safe 
environment?

And more generally, is it possible to get user console input in a 
@safe way?