Solving "unused variable this." warnings when using ReasonML objects

unused-this.md

unused variable this

You can create objects in ReasonML. For example:

let document = {
  pub title = "My Treatise";
  pub contents = "<a lot of words>"
};

If you compile this, you will most likely get warning number 27 with message unused variable this..

You can solve this by adding as _; as follows:

let document = {
  as _;
  pub title = "My Treatise";
  pub contents = "<a lot of words>"
};

Why is this the case?

Why is this the case?

As in why is there a variable this? It is an object, and you can write functions in the object like:

pub someFunction = () => 42;
pub getAnswer = () => this#someFunction()