From 6608678e9bb04dfbb430f9dfe5dbfa2da15e14b6 Mon Sep 17 00:00:00 2001
From: dishmaker <141624503+dishmaker@users.noreply.github.com>
Date: Fri, 10 Oct 2025 16:13:48 +0200
Subject: [PATCH] der: add doc example for `Decode`

---
 der/src/decode.rs | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/der/src/decode.rs b/der/src/decode.rs
index 452a624c5..58b6b4ba3 100644
--- a/der/src/decode.rs
+++ b/der/src/decode.rs
@@ -23,6 +23,29 @@ use crate::EncodingRules;
 ///
 /// When decoding fails, a [`Decode::Error`] type is thrown.
 /// Most ASN.1 DER objects return a builtin der [`Error`] type as [`Decode::Error`], which can be made from [`ErrorKind`].
+///
+/// ## Example
+///
+/// ```
+/// # #[cfg(all(feature = "alloc", feature = "std"))]
+/// # {
+/// use der::{Any, Decode, Reader};
+///
+/// /// Wrapper around Any, with custom foreign trait support.
+/// ///
+/// /// For example: serde Serialize/Deserialize
+/// pub struct AnySerde(pub Any);
+///
+/// impl<'a> Decode<'a> for AnySerde {
+///     type Error = der::Error;
+///
+///     fn decode<R: Reader<'a>>(reader: &mut R) -> der::Result<Self> {
+///         // calls impl Decode for Any
+///         Ok(Self(Any::decode(reader)?))
+///     }
+/// }
+/// # }
+/// ```
 #[diagnostic::on_unimplemented(
     note = "Consider adding impls of `DecodeValue` and `FixedTag` to `{Self}`"
 )]