On Mon, Jun 22, 2015 at 11:48:21AM -0400, Damien Doligez wrote:
> Gerd has totally nailed it, and that's the reason why I always use ;;
> in my code.
> If we had another keyword for toplevel let (let without in) the
> situation would be quite different.

I have a rule (which I introduced recently, and thus don't yet follow
much in my code) to use ;; to terminate all unit-returning (therefore
effectful) functions. Pure functions or effectful functions with a proper
return value never have the trailing-semicolon issue. An alternative
solution is to always return () from unit-returning functions, but I
found ;; more appealing.