[castle-bravo]

What do you consider to be the minimum for advanced type trickery? I ask to see if Ada might fit that criteria and and what features it might be lacking that would make it competitive with Rust in the type-trickery domain.

[Drup]

As far as I'm concerned, the minimal is sum, products and, most importantly, abstract parametric datatypes. This is sufficient for phantom types, and then the fun starts. More complex parametric types (with ad-hoc polymorphism for example) then extends what you can do.