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// When mutably indexing a type that implements `Index` but not `IndexMut`, a
// special 'help' message is added to the output.
fn main() {
use std::collections::HashMap;
let mut map = HashMap::new();
map.insert("peter", "23".to_string());
map["peter"].clear(); //~ ERROR
map["peter"] = "0".to_string(); //~ ERROR
let _ = &mut map["peter"]; //~ ERROR
}
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