1 files changed, 35 insertions, 0 deletions
diff --git a/library/alloc/tests/const_fns.rs b/library/alloc/tests/const_fns.rs
new file mode 100644
index 000000000..49b837bec
--- /dev/null
+++ b/library/alloc/tests/const_fns.rs
@@ -0,0 +1,35 @@
+// Test const functions in the library
+
+pub const MY_VEC: Vec<usize> = Vec::new();
+pub const MY_VEC2: Vec<usize> = Default::default();
+
+pub const MY_STRING: String = String::new();
+pub const MY_STRING2: String = Default::default();
+
+pub const MY_BOXED_SLICE: Box<[usize]> = Default::default();
+pub const MY_BOXED_STR: Box<str> = Default::default();
+
+use std::collections::{BTreeMap, BTreeSet};
+
+pub const MY_BTREEMAP: BTreeMap<usize, usize> = BTreeMap::new();
+pub const MAP: &'static BTreeMap<usize, usize> = &MY_BTREEMAP;
+pub const MAP_LEN: usize = MAP.len();
+pub const MAP_IS_EMPTY: bool = MAP.is_empty();
+
+pub const MY_BTREESET: BTreeSet<usize> = BTreeSet::new();
+pub const SET: &'static BTreeSet<usize> = &MY_BTREESET;
+pub const SET_LEN: usize = SET.len();
+pub const SET_IS_EMPTY: bool = SET.is_empty();
+
+#[test]
+fn test_const() {
+    assert_eq!(MY_VEC, MY_VEC2);
+    assert_eq!(MY_STRING, MY_STRING2);
+
+    assert_eq!(MY_VEC, *MY_BOXED_SLICE);
+    assert_eq!(MY_STRING, *MY_BOXED_STR);
+
+    assert_eq!(MAP_LEN, 0);
+    assert_eq!(SET_LEN, 0);
+    assert!(MAP_IS_EMPTY && SET_IS_EMPTY);
+}