Remove unnecessary unit binding

[Rustin170506]

It appears that the unit binding is not necessary at this time. However, I am unsure of its importance in the past. Please let me know if it is unsafe to remove.

[rustbot]

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[Mark-Simulacrum]

@bors r+ rollup

Not sure, but seems likely to be fine. I don't see any particularly interesting other similar cases.

[bors]

📌 Commit 6f1383c has been approved by Mark-Simulacrum

It is now in the queue for this repository.

[klensy]

Kind of static assert, like

rust/compiler/rustc_index/src/lib.rs

Lines 33 to 38 in c9c83cc

	#[macro_export]
	macro_rules! static_assert_size {
	($ty:ty, $size:expr) => {
	const _: [(); $size] = [(); ::std::mem::size_of::<$ty>()];
	};
	}

[codeworm96]

As far as I know, there are different ways to do a static assert in rust:

• inline_const (this PR)
• and the const block can be bound to _ (before this PR)
• const_wildcard (as the code pointed out by @klensy)

Are there any guidelines about choosing between them?