Remove actually_private::T

It just makes life harder in some cases without any benefits

serde/src/de/mod.rs

@@ -1228,7 +1228,6 @@ pub trait Deserializer<'de>: Sized {
     #[doc(hidden)]
     fn __deserialize_content<V>(
         self,
-        _: crate::actually_private::T,
         visitor: V,
     ) -> Result<crate::__private::de::Content<'de>, Self::Error>
     where

serde/src/lib.rs

@@ -340,8 +340,3 @@ extern crate serde_derive;
 #[cfg(feature = "serde_derive")]
 #[cfg_attr(docsrs, doc(cfg(feature = "derive")))]
 pub use serde_derive::{Deserialize, Serialize};
-
-#[cfg(all(not(no_serde_derive), any(feature = "std", feature = "alloc")))]
-mod actually_private {
-    pub struct T;
-}

serde/src/private/de.rs

@@ -208,7 +208,6 @@ mod content {
 
     use crate::lib::*;
 
-    use crate::actually_private;
     use crate::de::value::{MapDeserializer, SeqDeserializer};
     use crate::de::{
         self, size_hint, Deserialize, DeserializeSeed, Deserializer, EnumAccess, Expected,
@@ -298,7 +297,7 @@ mod content {
             // Untagged and internally tagged enums are only supported in
             // self-describing formats.
             let visitor = ContentVisitor { value: PhantomData };
-            deserializer.__deserialize_content(actually_private::T, visitor)
+            deserializer.__deserialize_content(visitor)
         }
     }
 
@@ -1498,11 +1497,7 @@ mod content {
             visitor.visit_unit()
         }
 
-        fn __deserialize_content<V>(
-            self,
-            _: actually_private::T,
-            visitor: V,
-        ) -> Result<Content<'de>, Self::Error>
+        fn __deserialize_content<V>(self, visitor: V) -> Result<Content<'de>, Self::Error>
         where
             V: Visitor<'de, Value = Content<'de>>,
         {
@@ -2091,11 +2086,7 @@ mod content {
             visitor.visit_unit()
         }
 
-        fn __deserialize_content<V>(
-            self,
-            _: actually_private::T,
-            visitor: V,
-        ) -> Result<Content<'de>, Self::Error>
+        fn __deserialize_content<V>(self, visitor: V) -> Result<Content<'de>, Self::Error>
         where
             V: Visitor<'de, Value = Content<'de>>,
         {