Feature gate context_deserialize impl

Author: macladson

src/runtime_types/context_deserialize.rs

@@ -0,0 +1,24 @@
+use crate::RuntimeVariableList;
+use context_deserialize::ContextDeserialize;
+use serde::{de::Error as DeError, Deserializer};
+
+impl<'de, C, T> ContextDeserialize<'de, (C, usize)> for RuntimeVariableList<T>
+where
+    T: ContextDeserialize<'de, C>,
+    C: Clone,
+{
+    fn context_deserialize<D>(deserializer: D, context: (C, usize)) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        // First parse out a Vec<C> using the Vec<C> impl you already have.
+        let vec: Vec<T> = Vec::context_deserialize(deserializer, context.0)?;
+        let vec_len = vec.len();
+        RuntimeVariableList::new(vec, context.1).map_err(|e| {
+            DeError::custom(format!(
+                "RuntimeVariableList length {} exceeds max_len {}: {e:?}",
+                vec_len, context.1,
+            ))
+        })
+    }
+}

src/runtime_types/mod.rs

@@ -1,3 +1,5 @@
+#[cfg(feature = "context_deserialize")]
+mod context_deserialize;
 mod runtime_fixed_vector;
 mod runtime_variable_list;
 

src/runtime_types/runtime_variable_list.rs

@@ -1,8 +1,6 @@
 use crate::Error;
-use context_deserialize::ContextDeserialize;
 use educe::Educe;
-use serde::de::Error as DeError;
-use serde::{Deserialize, Deserializer, Serialize};
+use serde::{Deserialize, Serialize};
 use ssz::Decode;
 use std::fmt;
 use std::fmt::Debug;
@@ -222,27 +220,6 @@ where
     }
 }
 
-impl<'de, C, T> ContextDeserialize<'de, (C, usize)> for RuntimeVariableList<T>
-where
-    T: ContextDeserialize<'de, C>,
-    C: Clone,
-{
-    fn context_deserialize<D>(deserializer: D, context: (C, usize)) -> Result<Self, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        // first parse out a Vec<C> using the Vec<C> impl you already have
-        let vec: Vec<T> = Vec::context_deserialize(deserializer, context.0)?;
-        let vec_len = vec.len();
-        RuntimeVariableList::new(vec, context.1).map_err(|e| {
-            DeError::custom(format!(
-                "RuntimeVariableList length {} exceeds max_len {}: {e:?}",
-                vec_len, context.1,
-            ))
-        })
-    }
-}
-
 impl<T: TreeHash> TreeHash for RuntimeVariableList<T> {
     fn tree_hash_type() -> tree_hash::TreeHashType {
         tree_hash::TreeHashType::List