Implement IntoDeserializer for public deserializers

Changelog.md

@@ -17,6 +17,7 @@
 
 - [#826]: Implement `From<String>` and `From<Cow<str>>` for `quick_xml::de::Text`.
 - [#826]: Make `SimpleTypeDeserializer` and `SimpleTypeSerializer` public.
+- [#826]: Implement `IntoDeserializer` for `&mut Deserializer`.
 
 ### Bug Fixes
 

src/de/mod.rs

@@ -2019,7 +2019,9 @@ use crate::{
     reader::Reader,
     utils::CowRef,
 };
-use serde::de::{self, Deserialize, DeserializeOwned, DeserializeSeed, SeqAccess, Visitor};
+use serde::de::{
+    self, Deserialize, DeserializeOwned, DeserializeSeed, IntoDeserializer, SeqAccess, Visitor,
+};
 use std::borrow::Cow;
 #[cfg(feature = "overlapped-lists")]
 use std::collections::VecDeque;
@@ -2990,6 +2992,19 @@ where
     }
 }
 
+impl<'de, 'a, R, E> IntoDeserializer<'de, DeError> for &'a mut Deserializer<'de, R, E>
+where
+    R: XmlRead<'de>,
+    E: EntityResolver,
+{
+    type Deserializer = Self;
+
+    #[inline]
+    fn into_deserializer(self) -> Self {
+        self
+    }
+}
+
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
 /// Helper struct that contains a state for an algorithm of converting events

src/de/simple_type.rs

@@ -10,7 +10,9 @@ use crate::escape::unescape;
 use crate::utils::CowRef;
 use memchr::memchr;
 use serde::de::value::UnitDeserializer;
-use serde::de::{DeserializeSeed, Deserializer, EnumAccess, SeqAccess, VariantAccess, Visitor};
+use serde::de::{
+    DeserializeSeed, Deserializer, EnumAccess, IntoDeserializer, SeqAccess, VariantAccess, Visitor,
+};
 use serde::serde_if_integer128;
 use std::borrow::Cow;
 use std::ops::Range;
@@ -770,6 +772,15 @@ impl<'de, 'a> EnumAccess<'de> for SimpleTypeDeserializer<'de, 'a> {
     }
 }
 
+impl<'de, 'a> IntoDeserializer<'de, DeError> for SimpleTypeDeserializer<'de, 'a> {
+    type Deserializer = Self;
+
+    #[inline]
+    fn into_deserializer(self) -> Self {
+        self
+    }
+}
+
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
 #[cfg(test)]