1 files changed, 79 insertions, 0 deletions
diff --git a/third_party/rust/warp/src/error.rs b/third_party/rust/warp/src/error.rs
new file mode 100644
index 0000000000..64220b633e
--- /dev/null
+++ b/third_party/rust/warp/src/error.rs
@@ -0,0 +1,79 @@
+use std::convert::Infallible;
+use std::error::Error as StdError;
+use std::fmt;
+
+type BoxError = Box<dyn std::error::Error + Send + Sync>;
+
+/// Errors that can happen inside warp.
+pub struct Error {
+    inner: BoxError,
+}
+
+impl Error {
+    pub(crate) fn new<E: Into<BoxError>>(err: E) -> Error {
+        Error { inner: err.into() }
+    }
+}
+
+impl fmt::Debug for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        // Skip showing worthless `Error { .. }` wrapper.
+        fmt::Debug::fmt(&self.inner, f)
+    }
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::Display::fmt(&self.inner, f)
+    }
+}
+
+impl StdError for Error {
+    fn source(&self) -> Option<&(dyn StdError + 'static)> {
+        Some(self.inner.as_ref())
+    }
+}
+
+impl From<Infallible> for Error {
+    fn from(infallible: Infallible) -> Error {
+        match infallible {}
+    }
+}
+
+#[test]
+fn error_size_of() {
+    assert_eq!(
+        ::std::mem::size_of::<Error>(),
+        ::std::mem::size_of::<usize>() * 2
+    );
+}
+
+#[test]
+fn error_source() {
+    let e = Error::new(std::fmt::Error {});
+    assert!(e.source().unwrap().is::<std::fmt::Error>());
+}
+
+macro_rules! unit_error {
+    (
+        $(#[$docs:meta])*
+        $pub:vis $typ:ident: $display:literal
+    ) => (
+        $(#[$docs])*
+        $pub struct $typ { _p: (), }
+
+        impl ::std::fmt::Debug for $typ {
+            fn fmt(&self, f: &mut ::std::fmt::Formatter<'_>) -> ::std::fmt::Result {
+                f.debug_struct(stringify!($typ)).finish()
+            }
+        }
+
+        impl ::std::fmt::Display for $typ {
+            fn fmt(&self, f: &mut ::std::fmt::Formatter<'_>) -> ::std::fmt::Result {
+                f.write_str($display)
+            }
+        }
+
+        impl ::std::error::Error for $typ {}
+    )
+}