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When encoutnering a case like ```rust //@ run-rustfix use std::collections::HashMap; fn main() { let vs = vec![0, 0, 1, 1, 3, 4, 5, 6, 3, 3, 3]; let mut counts = HashMap::new(); for num in vs { let count = counts.entry(num).or_insert(0); *count += 1; } let _ = counts.iter().max_by_key(|(_, v)| v); ``` produce the following suggestion ``` error: lifetime may not live long enough --> $DIR/return-value-lifetime-error.rs:13:47 | LL | let _ = counts.iter().max_by_key(|(_, v)| v); | ------- ^ returning this value requires that `'1` must outlive `'2` | | | | | return type of closure is &'2 &i32 | has type `&'1 (&i32, &i32)` | help: dereference the return value | LL | let _ = counts.iter().max_by_key(|(_, v)| **v); | ++ ``` Fix #50195. |
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