TMI: Exhausting all the possibilities

I closed #2735, which had to do with how

let _ = e;

and

e;

can have different semantics in Rust. As you might guess, "_" effectively means "I'm never going to use this, so just give it a name I can't refer to." (Left-hand sides of let decls, by the way, can be any irrefutable pattern.) So why would they be different?

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