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diff --git a/third_party/rust/bumpalo/src/collections/mod.rs b/third_party/rust/bumpalo/src/collections/mod.rs
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+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Collection types that allocate inside a [`Bump`] arena.
+//!
+//! [`Bump`]: ../struct.Bump.html
+
+#![allow(deprecated)]
+
+mod raw_vec;
+
+pub mod vec;
+pub use self::vec::Vec;
+
+mod str;
+pub mod string;
+pub use self::string::String;
+
+mod collect_in;
+pub use collect_in::{CollectIn, FromIteratorIn};
+
+// pub mod binary_heap;
+// mod btree;
+// pub mod linked_list;
+// pub mod vec_deque;
+
+// pub mod btree_map {
+//     //! A map based on a B-Tree.
+//     pub use super::btree::map::*;
+// }
+
+// pub mod btree_set {
+//     //! A set based on a B-Tree.
+//     pub use super::btree::set::*;
+// }
+
+// #[doc(no_inline)]
+// pub use self::binary_heap::BinaryHeap;
+
+// #[doc(no_inline)]
+// pub use self::btree_map::BTreeMap;
+
+// #[doc(no_inline)]
+// pub use self::btree_set::BTreeSet;
+
+// #[doc(no_inline)]
+// pub use self::linked_list::LinkedList;
+
+// #[doc(no_inline)]
+// pub use self::vec_deque::VecDeque;
+
+use crate::alloc::{AllocErr, LayoutErr};
+
+/// Augments `AllocErr` with a `CapacityOverflow` variant.
+#[derive(Clone, PartialEq, Eq, Debug)]
+// #[unstable(feature = "try_reserve", reason = "new API", issue="48043")]
+pub enum CollectionAllocErr {
+    /// Error due to the computed capacity exceeding the collection's maximum
+    /// (usually `isize::MAX` bytes).
+    CapacityOverflow,
+    /// Error due to the allocator (see the documentation for the [`AllocErr`] type).
+    AllocErr,
+}
+
+// #[unstable(feature = "try_reserve", reason = "new API", issue="48043")]
+impl From<AllocErr> for CollectionAllocErr {
+    #[inline]
+    fn from(AllocErr: AllocErr) -> Self {
+        CollectionAllocErr::AllocErr
+    }
+}
+
+// #[unstable(feature = "try_reserve", reason = "new API", issue="48043")]
+impl From<LayoutErr> for CollectionAllocErr {
+    #[inline]
+    fn from(_: LayoutErr) -> Self {
+        CollectionAllocErr::CapacityOverflow
+    }
+}
+
+// /// An intermediate trait for specialization of `Extend`.
+// #[doc(hidden)]
+// trait SpecExtend<I: IntoIterator> {
+//     /// Extends `self` with the contents of the given iterator.
+//     fn spec_extend(&mut self, iter: I);
+// }