From cb4875ec813ac4412ebc73a68ec33f76ff56b972 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bastian=20K=C3=B6cher?= <bkchr@users.noreply.github.com>
Date: Tue, 8 Oct 2019 17:41:52 +0200
Subject: [PATCH] Make `ParachainContext` take self as mutable (#458)

This replicates changes to `Environment`/`Proposer` that are used
internally at Cumulus.
---
 polkadot/collator/src/lib.rs                        | 6 +++---
 polkadot/test-parachains/adder/collator/src/main.rs | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/polkadot/collator/src/lib.rs b/polkadot/collator/src/lib.rs
index d9e96fa265..0f6b0febea 100644
--- a/polkadot/collator/src/lib.rs
+++ b/polkadot/collator/src/lib.rs
@@ -147,7 +147,7 @@ pub trait ParachainContext: Clone {
 	/// Produce a candidate, given the relay parent hash, the latest ingress queue information
 	/// and the last parachain head.
 	fn produce_candidate<I: IntoIterator<Item=(ParaId, Message)>>(
-		&self,
+		&mut self,
 		relay_parent: Hash,
 		status: ParachainStatus,
 		ingress: I,
@@ -174,7 +174,7 @@ pub fn collate<'a, R, P>(
 	local_id: ParaId,
 	parachain_status: ParachainStatus,
 	relay_context: R,
-	para_context: P,
+	mut para_context: P,
 	key: Arc<CollatorPair>,
 )
 	-> impl Future<Item=(parachain::Collation, OutgoingMessages), Error=Error<R::Error>> + 'a
@@ -489,7 +489,7 @@ mod tests {
 		type ProduceCandidate = Result<(BlockData, HeadData, OutgoingMessages), InvalidHead>;
 
 		fn produce_candidate<I: IntoIterator<Item=(ParaId, Message)>>(
-			&self,
+			&mut self,
 			_relay_parent: Hash,
 			_status: ParachainStatus,
 			ingress: I,
diff --git a/polkadot/test-parachains/adder/collator/src/main.rs b/polkadot/test-parachains/adder/collator/src/main.rs
index 25352b1610..473387d929 100644
--- a/polkadot/test-parachains/adder/collator/src/main.rs
+++ b/polkadot/test-parachains/adder/collator/src/main.rs
@@ -56,7 +56,7 @@ impl ParachainContext for AdderContext {
 	type ProduceCandidate = Result<(BlockData, HeadData, OutgoingMessages), InvalidHead>;
 
 	fn produce_candidate<I: IntoIterator<Item=(ParaId, Message)>>(
-		&self,
+		&mut self,
 		_relay_parent: Hash,
 		status: ParachainStatus,
 		ingress: I,