20 lines
779 B
Plaintext
20 lines
779 B
Plaintext
error[E0594]: cannot assign to data in an index of `BTreeMap<u32, u32>`
|
|
--> $DIR/btreemap-index-mut-2.rs:6:9
|
|
|
|
|
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`.
|