Bindings are sometimes incorrectly generated type + Borrow suffix vs & type

[calvinrp]

cargo component new --lib --target calvinrp:scratch-example --registry https://calvinrp.wa.dev scratch-example

generates:

#[allow(warnings)]
mod bindings;

use bindings::exports::calvinrp::scratch_example::service::{Guest, Key};

struct Component;

impl Guest for Component {
    fn sign(key: KeyBorrow) -> String {
        unimplemented!()
    }
}

bindings::export!(Component with_types_in bindings);

where
sign method's key arg should be &Key instead of KeyBorrow
and fails to compile since the KeyBorrow type does not exist

The WIT for the calvinrp:scratch-example is shown here:

package calvinrp:scratch-example@0.0.1;

/// An example world for the component to target.
world example {
    export service;
}

interface service {
  use other.{key};

  sign: func(key: borrow<key>) -> string;
}

interface other {
  resource key {}
}

[calvinrp]

OK, figured it out. If the interface types are exported in the target world, then wit-bindgen-rust uses SomeBorrow instead of &Some. But cargo-component doesn't implement the same logic.

PR in the works

[calvinrp]

#300 fixes