'How can I declare a default constructed char?

This seems to be a simple question but I am very new to Rust so I am still asking. So, I could not get a way to declare char in default constructed or leave uninitialized and this is what I did:

let mut r: char = 0 as char;
// let mut r: char; // error

I do not know it is right the way to do it or is there are proper way to do it?

rust

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'How can I declare a default constructed char?

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