Woow! Rust now has a `todo!()` macro in 1.40.0! This is much shorter and easier to write than the `unimplemented!()` macro, and is cause for much celebration!
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Replying to @rustlang
I feel bad that todo!() macro getting less exposure 
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Full disclosure: I was the one who added `unimplemented!()` way back before 1.0, and I’ve felt bad ever since. Good to see this finally being fixed! ❤️