wit-bindgen-cli 0.57.0

CLI tool to generate bindings for WIT documents and the component model. 
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package foo:foo;

interface option-result {
  // NB: this record used to be empty, but that's no longer valid, so now it's
  // non-empty. Don't want to delete the whole test however.
  record empty {
    not-empty-anymore: bool,
  }
  record o-one {
    a: option<bool>,
  }

  record o-nested {
    a: option<option<o-one>>,
  }

  type o1 = option<o-one>;
  type o2 = option<empty>;
  type o4 = option<option<o-nested>>;

  type r1 = result;
  type r2 = result<_, empty>;
  type r3 = result<empty>;
  type r4 = result<empty, empty>;
  type r5 = result<option<o-one>, o1>;
  type r6 = result<option<option<o-one>>, o2>;
  type r7 = result<option<option<o-one>>, o4>;


  type o5 = option<result>;
  type o6 = option<result<option<result>>>;


   o5-arg: func(x: o5);
   o5-result: func() -> o5;

   o6-arg: func(x: o6);
   o6-result: func() -> o6;

   r1-arg: func(x: r1);
   r1-result: func() -> r1;

   r2-arg: func(x: r2);
   r2-result: func() -> r2;

   r3-arg: func(x: r3);
   r3-result: func() -> r3;

   r4-arg: func(x: r4);
   r4-result: func() -> r4;

   r5-arg: func(x: r5);
   r5-result: func() -> r5;

   r6-arg: func(x: r6);
   r6-result: func() -> r6;

   r7-arg: func(x: r7);
   r7-result: func() -> r7;

   multi: func(x: r7, y: r7) -> tuple<r7, r7, r7>;
   multi-option: func(x: r7, y: r7) -> option<tuple<r7, r7>>;
}

world my-world {
  import option-result;
  export option-result;
}