wit-bindgen-cli 0.57.1

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

interface option-simple {
  // NB: this record used to be empty, but that's no longer valid, so now it's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 o3 = option<o-nested>;
  type o4 = option<option<o-nested>>;


   oint-arg: func(x: option<s32>);
   oint-result: func() -> option<s32>;

   o1-arg: func(x: o1);
   o1-result: func() -> o1;

   o2-arg: func(x: o2);
   o2-result: func() -> o2;

   o3-arg: func(x: o3);
   o3-result: func() -> o3;

   o4-arg: func(x: o4);
   o4-result: func() -> o4;
}

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