1 files changed, 15 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-41726.stderr b/tests/ui/issues/issue-41726.stderr
new file mode 100644
index 000000000..b05c1fb14
--- /dev/null
+++ b/tests/ui/issues/issue-41726.stderr
@@ -0,0 +1,15 @@
+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`.