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error[E0596]: cannot borrow data in an index of `HashMap<String, Vec<String>>` as mutable
--> $DIR/issue-41726.rs:5:9
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LL | things[src.as_str()].sort();
| ^^^^^^^^^^^^^^^^^^^^ cannot borrow as mutable
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= help: trait `IndexMut` is required to modify indexed content, but it is not implemented for `HashMap<String, Vec<String>>`
= help: to modify a `HashMap<String, Vec<String>>`, use `.get_mut()`, `.insert()` or the entry API
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0596`.
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