1 error[E0596]: cannot borrow data in a `&` reference 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 `std::collections::HashMap<std::string::String, std::vec::Vec<std::string::String>>`
9 error: aborting due to previous error
11 For more information about this error, try `rustc --explain E0596`.