Comment by int_19h

As far as "semi-dynamic" goes, C# has an interesting take coming from the other direction - i.e. a fully statically typed language originally bolting dynamic duck typing later on.

It's done in a way that allows for a lot of subtlety, too. Basically you can use "dynamic" in lieu of most type annotations, and what this does is make any dispatch (in a broad sense - this includes stuff like e.g. overload resolution, not just member dispatch) on that particular value dynamic, but without affecting other values involved in the expression.