Passing in vectors

You can pass a Rust std::vec::Vec into your contract method transparently. The following code calls a Sway contract method which accepts a Vec<SomeStruct<u32>>.

        let arg = vec![SomeStruct { a: 0 }, SomeStruct { a: 1 }];

You can use a vector just like you would use any other type -- e.g. a [Vec<u32>; 2] or a SomeStruct<Vec<Bits256>> etc.

Returning vectors

This is currently not supported. If you try returning a type that is or contains a vector you will get a compile time error.