On Monday, 22 June 2015 at 20:56:12 UTC, Jonathan M Davis wrote:
won't mutate the argument, but if you allow it with ref in general, then you stand no chance of being able to look at a function signature and deduce whether the function intends to mutate an argument or not.- Jonathan M Davis
It's no worse than auto ref. It's only by convention that auto ref functions doesn't mutate, at least I follow that convention, but when looking at someone else's function, all bets are off.
