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impl [const] Default for BTreeMap #157878

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impl [const] Default for BTreeMap #157878

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3 changes: 2 additions & 1 deletion library/alloc/src/collections/btree/map.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2594,7 +2594,8 @@ impl<K: Hash, V: Hash, A: Allocator + Clone> Hash for BTreeMap<K, V, A> {
}

#[stable(feature = "rust1", since = "1.0.0")]
impl<K, V> Default for BTreeMap<K, V> {
#[rustc_const_unstable(feature = "const_default", issue = "143894")]
const impl<K, V> Default for BTreeMap<K, V> {
/// Creates an empty `BTreeMap`.
fn default() -> BTreeMap<K, V> {
BTreeMap::new()
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3 changes: 3 additions & 0 deletions tests/ui/traits/const-traits/const-traits-alloc.rs
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Expand Up @@ -5,5 +5,8 @@
const STRING: String = Default::default();
// alloc::vec
const VEC: Vec<()> = Default::default();
// alloc::collections::btree::map::BTreeMap
use std::collections::BTreeMap;
const BTREE: BTreeMap<(), ()> = Default::default();

fn main() {}
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