Pass Vec reference or slice to function

[seanlinsley]

https://github.com/rune-rs/rune/issues/288#issuecomment-960639458 suggests that Vm::call should accept references, but when modifying the vector.rs example I can't get either &Vec or &[] to work:

error[E0277]: the trait bound `&std::vec::Vec<{integer}>: AnyMarker` is not satisfied
   --> examples/examples/vector.rs:40:37
    |
40  |     let output = vm.call(["calc"], (&input,))?;
    |                     ----            ^^^^^^ the trait `AnyMarker` is not implemented for `&std::vec::Vec<{integer}>`
    |                     |
    |                     required by a bound introduced by this call

error[E0277]: the trait bound `&[{integer}]: AnyMarker` is not satisfied
   --> examples/examples/vector.rs:40:37
    |
40  |     let output = vm.call(["calc"], (input.as_slice(),))?;
    |                     ----            ^^^^^^^^^^^^^^^^ the trait `AnyMarker` is not implemented for `&[{integer}]`
    |                     |
    |                     required by a bound introduced by this call

Also to confirm, if it did compile, will the input still be used by the function as a reference or is it internally cloned/serialized? It's important not to clone it to avoid performance bottlenecks.

[udoprog]

It cannot accept slices directly, since we wouldn't know what yo do with them. You'd have to wrap the type passed in into something deriving Any. Like a newtype. That gives it a type hash anf a name which is needed for Rune to deal with it directly.