Prefix operator for nullary procedure call

[foxfriends]

Seems like it will be fairly common to call a computed nullary procedure (returned from a function), for constructing monad like structures or such using effects. ()!() works but it's so ugly. I like <- or something, could be syntax sugar in unifications only? Or a full on operator but then it is let x = <- call which is a bit much... if it's only in unifications we can't do one and discard the result as succinctly (let _ <- call)?

Maybe also for "calling" a module instance? Or is that too pythonic, to define a __call__ method equivalent.

[foxfriends]

Alternatively, how weird is let x ()= call or let x !()= call.

Still no solution for discarding succinctly.

Could allow this for reassignment too, consistent with the existing pattern... though who would do that.

This one does allow for passing parameters though, so it's properly generalized, and reuses existing syntax best