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diff --git a/third_party/rust/xml-rs/src/writer/mod.rs b/third_party/rust/xml-rs/src/writer/mod.rs
new file mode 100644
index 0000000000..ea1b24266f
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+++ b/third_party/rust/xml-rs/src/writer/mod.rs
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+//! Contains high-level interface for an events-based XML emitter.
+//!
+//! The most important type in this module is `EventWriter` which allows writing an XML document
+//! to some output stream.
+
+pub use self::emitter::Result;
+pub use self::emitter::EmitterError as Error;
+pub use self::config::EmitterConfig;
+pub use self::events::XmlEvent;
+
+use self::emitter::Emitter;
+
+use std::io::prelude::*;
+
+mod emitter;
+mod config;
+pub mod events;
+
+/// A wrapper around an `std::io::Write` instance which emits XML document according to provided
+/// events.
+pub struct EventWriter<W> {
+    sink: W,
+    emitter: Emitter
+}
+
+impl<W: Write> EventWriter<W> {
+    /// Creates a new `EventWriter` out of an `std::io::Write` instance using the default
+    /// configuration.
+    #[inline]
+    pub fn new(sink: W) -> EventWriter<W> {
+        EventWriter::new_with_config(sink, EmitterConfig::new())
+    }
+
+    /// Creates a new `EventWriter` out of an `std::io::Write` instance using the provided
+    /// configuration.
+    #[inline]
+    pub fn new_with_config(sink: W, config: EmitterConfig) -> EventWriter<W> {
+        EventWriter {
+            sink,
+            emitter: Emitter::new(config)
+        }
+    }
+
+    /// Writes the next piece of XML document according to the provided event.
+    ///
+    /// Note that output data may not exactly correspond to the written event because
+    /// of various configuration options. For example, `XmlEvent::EndElement` may
+    /// correspond to a separate closing element or it may cause writing an empty element.
+    /// Another example is that `XmlEvent::CData` may be represented as characters in
+    /// the output stream.
+    pub fn write<'a, E>(&mut self, event: E) -> Result<()> where E: Into<XmlEvent<'a>> {
+        match event.into() {
+            XmlEvent::StartDocument { version, encoding, standalone } =>
+                self.emitter.emit_start_document(&mut self.sink, version, encoding.unwrap_or("UTF-8"), standalone),
+            XmlEvent::ProcessingInstruction { name, data } =>
+                self.emitter.emit_processing_instruction(&mut self.sink, name, data),
+            XmlEvent::StartElement { name, attributes, namespace } => {
+                self.emitter.namespace_stack_mut().push_empty().checked_target().extend(namespace.as_ref());
+                self.emitter.emit_start_element(&mut self.sink, name, &attributes)
+            }
+            XmlEvent::EndElement { name } => {
+                let r = self.emitter.emit_end_element(&mut self.sink, name);
+                self.emitter.namespace_stack_mut().try_pop();
+                r
+            }
+            XmlEvent::Comment(content) =>
+                self.emitter.emit_comment(&mut self.sink, content),
+            XmlEvent::CData(content) =>
+                self.emitter.emit_cdata(&mut self.sink, content),
+            XmlEvent::Characters(content) =>
+                self.emitter.emit_characters(&mut self.sink, content)
+        }
+    }
+
+    /// Returns a mutable reference to the underlying `Writer`.
+    ///
+    /// Note that having a reference to the underlying sink makes it very easy to emit invalid XML
+    /// documents. Use this method with care. Valid use cases for this method include accessing
+    /// methods like `Write::flush`, which do not emit new data but rather change the state
+    /// of the stream itself.
+    pub fn inner_mut(&mut self) -> &mut W {
+        &mut self.sink
+    }
+
+    /// Unwraps this `EventWriter`, returning the underlying writer.
+    ///
+    /// Note that this is a destructive operation: unwrapping a writer and then wrapping
+    /// it again with `EventWriter::new()` will create a fresh writer whose state will be
+    /// blank; for example, accumulated namespaces will be reset.
+    pub fn into_inner(self) -> W {
+        self.sink
+    }
+}