would be cool if rustc didn't warn about unused variables when there is a `todo!()` that, once filled in, will presumably start using those variables in the future
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I've though it would be cool if you could do something like: `todo!(foo, bar, baz)` maybe… but yeah I wish Rust had better support for hole driven development in general. Like letting you put holes in types and patterns, and having editor support for manipulating them…

