1 files changed, 49 insertions, 0 deletions
diff --git a/third_party/rust/hashbrown/src/scopeguard.rs b/third_party/rust/hashbrown/src/scopeguard.rs
new file mode 100644
index 0000000000..32c9694372
--- /dev/null
+++ b/third_party/rust/hashbrown/src/scopeguard.rs
@@ -0,0 +1,49 @@
+// Extracted from the scopeguard crate
+use core::ops::{Deref, DerefMut};
+
+pub struct ScopeGuard<T, F>
+where
+    F: FnMut(&mut T),
+{
+    dropfn: F,
+    value: T,
+}
+
+#[cfg_attr(feature = "inline-more", inline)]
+pub fn guard<T, F>(value: T, dropfn: F) -> ScopeGuard<T, F>
+where
+    F: FnMut(&mut T),
+{
+    ScopeGuard { dropfn, value }
+}
+
+impl<T, F> Deref for ScopeGuard<T, F>
+where
+    F: FnMut(&mut T),
+{
+    type Target = T;
+    #[cfg_attr(feature = "inline-more", inline)]
+    fn deref(&self) -> &T {
+        &self.value
+    }
+}
+
+impl<T, F> DerefMut for ScopeGuard<T, F>
+where
+    F: FnMut(&mut T),
+{
+    #[cfg_attr(feature = "inline-more", inline)]
+    fn deref_mut(&mut self) -> &mut T {
+        &mut self.value
+    }
+}
+
+impl<T, F> Drop for ScopeGuard<T, F>
+where
+    F: FnMut(&mut T),
+{
+    #[cfg_attr(feature = "inline-more", inline)]
+    fn drop(&mut self) {
+        (self.dropfn)(&mut self.value)
+    }
+}