1 files changed, 16 insertions, 0 deletions
diff --git a/vendor/der/src/encode.rs b/vendor/der/src/encode.rs
index d480b7bbd..28d7cba77 100644
--- a/vendor/der/src/encode.rs
+++ b/vendor/der/src/encode.rs
@@ -1,6 +1,7 @@
 //! Trait definition for [`Encode`].
 
 use crate::{Header, Length, Result, SliceWriter, Tagged, Writer};
+use core::marker::PhantomData;
 
 #[cfg(feature = "alloc")]
 use {alloc::boxed::Box, alloc::vec::Vec, core::iter};
@@ -82,6 +83,21 @@ where
     }
 }
 
+/// Dummy implementation for [`PhantomData`] which allows deriving
+/// implementations on structs with phantom fields.
+impl<T> Encode for PhantomData<T>
+where
+    T: ?Sized,
+{
+    fn encoded_len(&self) -> Result<Length> {
+        Ok(Length::ZERO)
+    }
+
+    fn encode(&self, _writer: &mut impl Writer) -> Result<()> {
+        Ok(())
+    }
+}
+
 /// PEM encoding trait.
 ///
 /// This trait is automatically impl'd for any type which impls both