1 files changed, 25 insertions, 0 deletions
diff --git a/tests/ui/zero-sized/zero-sized-btreemap-insert.rs b/tests/ui/zero-sized/zero-sized-btreemap-insert.rs
new file mode 100644
index 00000000000..52edb33d6ad
--- /dev/null
+++ b/tests/ui/zero-sized/zero-sized-btreemap-insert.rs
@@ -0,0 +1,25 @@
+// run-pass
+#![allow(unused_variables)]
+#![allow(unused_imports)]
+use std::cmp::{Ord, Ordering, PartialOrd};
+use std::collections::BTreeMap;
+use std::iter::Iterator;
+
+#[derive(Eq, Hash, Debug, Ord, PartialEq, PartialOrd)]
+struct Zst;
+
+fn main() {
+    const N: usize = 8;
+
+    for len in 0..N {
+        let mut tester = BTreeMap::new();
+        assert_eq!(tester.len(), 0);
+        for bit in 0..len {
+            tester.insert(Zst, ());
+        }
+        assert_eq!(tester.len(), if len == 0 { 0 } else { 1 });
+        assert_eq!(tester.iter().count(), if len == 0 { 0 } else { 1 });
+        assert_eq!(tester.get(&Zst).is_some(), len > 0);
+        tester.clear();
+    }
+}