Auto merge of #29299 - tbu-:pr_btreemap_example_dup, r=alexcrichton
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//! ```
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//! use std::collections::btree_map::BTreeMap;
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//!
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//! // A client of the bar. They have an id and a blood alcohol level.
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//! struct Person { id: u32, blood_alcohol: f32 }
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//! // A client of the bar. They have a blood alcohol level.
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//! struct Person { blood_alcohol: f32 }
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//!
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//! // All the orders made to the bar, by client id.
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//! let orders = vec![1,2,1,2,3,4,1,2,2,3,4,1,1,1];
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//! for id in orders {
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//! // If this is the first time we've seen this customer, initialize them
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//! // with no blood alcohol. Otherwise, just retrieve them.
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//! let person = blood_alcohol.entry(id).or_insert(Person{id: id, blood_alcohol: 0.0});
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//! let person = blood_alcohol.entry(id).or_insert(Person { blood_alcohol: 0.0 });
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//!
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//! // Reduce their blood alcohol level. It takes time to order and drink a beer!
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//! person.blood_alcohol *= 0.9;
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//! // Check if they're sober enough to have another beer.
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//! if person.blood_alcohol > 0.3 {
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//! // Too drunk... for now.
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//! println!("Sorry {}, I have to cut you off", person.id);
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//! println!("Sorry {}, I have to cut you off", id);
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//! } else {
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//! // Have another!
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//! person.blood_alcohol += 0.1;
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