Use Pin<Box<>> for collation future (#1792)

polkadot/node/primitives/src/lib.rs

@@ -35,6 +35,7 @@ use polkadot_statement_table::{
 	},
 	v1::Misbehavior as TableMisbehavior,
 };
+use std::pin::Pin;
 
 pub use sp_core::traits::SpawnNamed;
 
@@ -289,7 +290,7 @@ pub struct CollationGenerationConfig {
 	/// Will be called with the hash of the relay chain block the parachain
 	/// block should be build on and the [`ValidationData`] that provides
 	/// information about the state of the parachain on the relay chain.
-	pub collator: Box<dyn Fn(Hash, &ValidationData) -> Box<dyn Future<Output = Option<Collation>> + Unpin + Send> + Send + Sync>,
+	pub collator: Box<dyn Fn(Hash, &ValidationData) -> Pin<Box<dyn Future<Output = Option<Collation>> + Send>> + Send + Sync>,
 	/// The parachain that this collator collates for
 	pub para_id: ParaId,
 }