1 files changed, 17 insertions, 0 deletions
diff --git a/tests/ui/str/str-mut-idx.rs b/tests/ui/str/str-mut-idx.rs
new file mode 100644
index 00000000000..575a9eae859
--- /dev/null
+++ b/tests/ui/str/str-mut-idx.rs
@@ -0,0 +1,17 @@
+fn bot<T>() -> T { loop {} }
+
+fn mutate(s: &mut str) {
+    s[1..2] = bot();
+    //~^ ERROR the size for values of type
+    //~| ERROR the size for values of type
+    s[1usize] = bot();
+    //~^ ERROR the type `str` cannot be indexed by `usize`
+    s.get_mut(1);
+    //~^ ERROR the type `str` cannot be indexed by `{integer}`
+    s.get_unchecked_mut(1);
+    //~^ ERROR the type `str` cannot be indexed by `{integer}`
+    s['c'];
+    //~^ ERROR the type `str` cannot be indexed by `char`
+}
+
+pub fn main() {}