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-rw-r--r--src/test/ui/hashmap/hashmap-index-mut.rs6
-rw-r--r--src/test/ui/hashmap/hashmap-index-mut.stderr19
2 files changed, 25 insertions, 0 deletions
diff --git a/src/test/ui/hashmap/hashmap-index-mut.rs b/src/test/ui/hashmap/hashmap-index-mut.rs
new file mode 100644
index 000000000..98448e9d5
--- /dev/null
+++ b/src/test/ui/hashmap/hashmap-index-mut.rs
@@ -0,0 +1,6 @@
+use std::collections::HashMap;
+
+fn main() {
+ let mut map = HashMap::<u32, u32>::new();
+ map[&0] = 1; //~ ERROR cannot assign
+}
diff --git a/src/test/ui/hashmap/hashmap-index-mut.stderr b/src/test/ui/hashmap/hashmap-index-mut.stderr
new file mode 100644
index 000000000..c1948ab62
--- /dev/null
+++ b/src/test/ui/hashmap/hashmap-index-mut.stderr
@@ -0,0 +1,19 @@
+error[E0594]: cannot assign to data in an index of `HashMap<u32, u32>`
+ --> $DIR/hashmap-index-mut.rs:5:5
+ |
+LL | map[&0] = 1;
+ | ^^^^^^^^^^^ cannot assign
+ |
+ = help: trait `IndexMut` is required to modify indexed content, but it is not implemented for `HashMap<u32, u32>`
+help: to modify a `HashMap<u32, u32>`, use `.get_mut()`, `.insert()` or the entry API
+ |
+LL | map.insert(&0, 1);
+ | ~~~~~~~~ ~ +
+LL | map.get_mut(&0).map(|val| { *val = 1; });
+ | ~~~~~~~~~ ~~~~~~~~~~~~~~~~~~ ++++
+LL | let val = map.entry(&0).or_insert(1);
+ | +++++++++ ~~~~~~~ ~~~~~~~~~~~~ +
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0594`.