| error[E0594]: cannot assign to data in an index of `BTreeMap<u32, u32>` |
| --> $DIR/btreemap-index-mut.rs:5:5 |
| | |
| LL | map[&0] = 1; |
| | ^^^^^^^^^^^ cannot assign |
| | |
| = help: trait `IndexMut` is required to modify indexed content, but it is not implemented for `BTreeMap<u32, u32>` |
| help: to modify a `BTreeMap<u32, u32>`, use `.get_mut()`, `.insert()` or the entry API |
| | |
| LL | map.insert(&0, 1); |
| | ~~~~~~~~ ~ + |
| LL | map.get_mut(&0).map(|val| { *val = 1; }); |
| | ~~~~~~~~~ ~~~~~~~~~~~~~~~~~~ ++++ |
| LL | let val = map.entry(&0).or_insert(1); |
| | +++++++++ ~~~~~~~ ~~~~~~~~~~~~ + |
| |
| error: aborting due to 1 previous error |
| |
| For more information about this error, try `rustc --explain E0594`. |
