Make InPlaceSeed private

serde_core/src/private/mod.rs

@@ -1,5 +1,6 @@
 #[cfg(all(not(no_serde_derive), any(feature = "std", feature = "alloc")))]
 mod content;
+mod seed;
 
 #[doc(hidden)]
 pub mod size_hint;
@@ -10,3 +11,5 @@ pub mod string;
 #[cfg(all(not(no_serde_derive), any(feature = "std", feature = "alloc")))]
 #[doc(hidden)]
 pub use self::content::{Content, ContentVisitor};
+#[doc(hidden)]
+pub use self::seed::InPlaceSeed;

serde_core/src/private/seed.rs

@@ -0,0 +1,19 @@
+use crate::de::{Deserialize, DeserializeSeed, Deserializer};
+
+/// A DeserializeSeed helper for implementing deserialize_in_place Visitors.
+///
+/// Wraps a mutable reference and calls deserialize_in_place on it.
+pub struct InPlaceSeed<'a, T: 'a>(pub &'a mut T);
+
+impl<'a, 'de, T> DeserializeSeed<'de> for InPlaceSeed<'a, T>
+where
+    T: Deserialize<'de>,
+{
+    type Value = ();
+    fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        T::deserialize_in_place(deserializer, self.0)
+    }
+}