1 files changed, 12 insertions, 0 deletions
diff --git a/vendor/der/src/decode.rs b/vendor/der/src/decode.rs
index 0efcae69f..fe53341b3 100644
--- a/vendor/der/src/decode.rs
+++ b/vendor/der/src/decode.rs
@@ -1,6 +1,7 @@
 //! Trait definition for [`Decode`].
 
 use crate::{FixedTag, Header, Reader, Result, SliceReader};
+use core::marker::PhantomData;
 
 #[cfg(feature = "pem")]
 use crate::{pem::PemLabel, PemReader};
@@ -38,6 +39,17 @@ where
     }
 }
 
+/// Dummy implementation for [`PhantomData`] which allows deriving
+/// implementations on structs with phantom fields.
+impl<'a, T> Decode<'a> for PhantomData<T>
+where
+    T: ?Sized,
+{
+    fn decode<R: Reader<'a>>(_reader: &mut R) -> Result<PhantomData<T>> {
+        Ok(PhantomData)
+    }
+}
+
 /// Marker trait for data structures that can be decoded from DER without
 /// borrowing any data from the decoder.
 ///