Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/third_party/rust/indexmap/src/equivalent.rs b/third_party/rust/indexmap/src/equivalent.rs
new file mode 100644
index 0000000000..ad6635ffac
--- /dev/null
+++ b/third_party/rust/indexmap/src/equivalent.rs
@@ -0,0 +1,27 @@
+use core::borrow::Borrow;
+
+/// Key equivalence trait.
+///
+/// This trait allows hash table lookup to be customized.
+/// It has one blanket implementation that uses the regular `Borrow` solution,
+/// just like `HashMap` and `BTreeMap` do, so that you can pass `&str` to lookup
+/// into a map with `String` keys and so on.
+///
+/// # Contract
+///
+/// The implementor **must** hash like `K`, if it is hashable.
+pub trait Equivalent<K: ?Sized> {
+    /// Compare self to `key` and return `true` if they are equal.
+    fn equivalent(&self, key: &K) -> bool;
+}
+
+impl<Q: ?Sized, K: ?Sized> Equivalent<K> for Q
+where
+    Q: Eq,
+    K: Borrow<Q>,
+{
+    #[inline]
+    fn equivalent(&self, key: &K) -> bool {
+        *self == *key.borrow()
+    }
+}