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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
   |
LL |         things[src.as_str()].sort();
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot borrow as mutable
   |
   = 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()`
   |
LL |         things.get_mut(src.as_str()).map(|val| val.sort());
   |               ~~~~~~~~~            ~~~~~~~~~~~~~~~       +

error: aborting due to previous error

For more information about this error, try `rustc --explain E0596`.