rust/tests/ui/btreemap/btreemap-index-mut.rs

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use std::collections::BTreeMap;

fn main() {
    let mut map = BTreeMap::<u32, u32>::new();
    map[&0] = 1; //~ ERROR cannot assign
}
Suggest alternatives when trying to mutate a `HashMap`/`BTreeMap` via indexing The error can be quite confusing to newcomers. 2022-08-23 15:15:34 +00:00			`use std::collections::BTreeMap;`

			`fn main() {`
			`let mut map = BTreeMap::<u32, u32>::new();`
			`map[&0] = 1; //~ ERROR cannot assign`
			`}`