mirror of https://github.com/rust-lang/rust
20 lines
779 B
Plaintext
20 lines
779 B
Plaintext
error[E0594]: cannot assign to data in an index of `BTreeMap<u32, u32>`
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--> $DIR/btreemap-index-mut-2.rs:6:9
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LL | map[&0] = 1;
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| ^^^^^^^^^^^ cannot assign
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= help: trait `IndexMut` is required to modify indexed content, but it is not implemented for `BTreeMap<u32, u32>`
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help: to modify a `BTreeMap<u32, u32>`, use `.get_mut()`, `.insert()` or the entry API
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LL | map.insert(&0, 1);
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| ~~~~~~~~ ~ +
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LL | map.get_mut(&0).map(|val| { *val = 1; });
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| ~~~~~~~~~ ~~~~~~~~~~~~~~~~~~ ++++
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LL | let val = map.entry(&0).or_insert(1);
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| +++++++++ ~~~~~~~ ~~~~~~~~~~~~ +
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error: aborting due to 1 previous error
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For more information about this error, try `rustc --explain E0594`.
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