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#![warn(clippy::map_entry)]
#![allow(dead_code)]
use std::collections::BTreeMap;
fn foo() {}
fn btree_map<K: Eq + Ord + Copy, V: Copy>(m: &mut BTreeMap<K, V>, k: K, v: V) {
// insert then do something, use if let
if let std::collections::btree_map::Entry::Vacant(e) = m.entry(k) {
e.insert(v);
foo();
}
}
fn main() {}
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