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